Chevy tbi fuel pressure. Free Shipping; $4,634.

Chevy tbi fuel pressure Joined Nov 23, 2007 · Install fuel pressure gauge between steel line and flexible hose. Excess fuel is the fuel pressure for a TBI is 9-13 the higher numbers are for the multi port injection. Was an old mans truck with handicap plates and everything I've disassembled has been super clean. Follow the strategy based diagnostic flowchart beginning with A3 provided A1 and A2 are not applicable to Jun 9, 2009 · 92 chevy tbi 350 surge problem tried all sensors,fuel regulator,distributer,computer, scan tool-no codes,any ideas? - GMC 1998 Sierra question. 3L V6 - 1986 - 1993 Chevy S10 2. 01-29-2013 #8. At least I hope that's all it is.  · Post: 1987 Chevy TBI help (Topic#287027) okc87silverado Forum Newbie Posts: 5 Age: 32 Loc: Oklahoma Reg: 09-15-12. The one under the engine, right above the oil filter is the sending unit for the pressure gauge. Add To Cart Add to Wish List. Google tells me it is most likely either the fuel pump or the fuel pressure regulator. Jul 20, 2024 · There is ZERO fuel from the injectors when cranking and the tips are bone dry. I had to swap the spring from the 305 to the 350's regulator because of a rusty spring. Package Dimensions: 13. However, they can be improved. Main content A-Premium Set of 2 Fuel Injectors Compatible with Chevrolet Tahoe, Blazer, Caprice & GMC Yukon, C1500 & Buick Roadmaster & Cadillac Brougham & Isuzu NPR & Oldsmobile Feb 20, 2002 · 350TBI swap - Fuel Pressure Question. Post: 1995 5. Read that it should be 11psi after the regulator. Connect a scan tool, find out what the computer wants you to know. then if you can afford it a set of noid lights and a TBI fuel pressure test kit (with correct adapter) would be the next best step. BETOOLL. It also could be your MAP sensor isn't doing its job or isn't getting a good vaccum. Original problem was that the truck dies or hesitates off idle. Jun 27, 2013 · TBI regulated pressure never went over 13psi until the 94-95 TBI 454 went to 30. where does the gauge go,running or not running. Evening, I have a 1993 Chevy Silverado 7. Post: Testing fuel pressure on 95 truck TBI (Topic#354565) Roadyacht Newbie Posts: 19 Reg: 07-19 The fuel pressure on a Chevy 350 TBI should be between 10-13 psi at idle. Used distributor  · Even a stock TBI engine with the low pressure fuel system runs best at 13-14 psi. 3. The fuel pump pressure specification for the models covered by this tutorial is: 9-13 PSI Key On With Engine Off. Send Private Topic  · Remove the fuel feed line from the fuel filter outlet. Jun 21, 2019 · Chevy Truck Tech Forums. 2 watchers. I actually put an adjustable fuel pressure regulator on, along with a gauge. They would not do it so , again, we spent the time and $ to do it ourselves. A local shop replaced her fuel pump, I checked the pressure, its almost 13 lbs, pinched the return line like ChevyTech outlined in the FAQ and the pressure surged, idle dropped substantially so I assumed it was the regulator spring. com Jul 21, 2021 · Your TBI regulator wont be able to bring Vortec pressure (around 60psi) down to 12-15psi. JET 61500 TBI Billet Aluminum Adjustable Fuel Pressure Regulator. Once the adapter is in place, you'll connect the fuel pressure test gauge to it. View Profile View Forum Posts Private Message Fuel Injected! Join Date Nov 2011 Location Jun 23, 2012 · Fuel pressure I 'm not sure about TBI fuel pressure but TPI pressure is checked with the vacumn hose disconnected to the map sensor . Other way is to install a Deamon Carb with an adaptor plate. 111. Fuel pressure regulator spring for GM TBI fuel injected throttle body. It threads into the fuel system with a 1/8-27 NPT Male Thread located on the back. 588 L x 11. I currently have 30 psi across the board. First I start with a new Fuel pump, STOCK 75lph TBI fuel pump will only support about 230hp before the fuel pressure drops like a rock. Custom TPI Chip $ 360. The fuel pressure will increase and stabilize at approximately 345 Kpa (50 psi). If not, refer to DIAGNOSTIC CHARTS/FUEL SYSTEM PRESSURE TEST (CHART A-6). Pro Fuel Injection Pressure Tester Kit Gauge 0-140 PSI. 7. 1990 Chevy Suburban 5. There's no need to guess as the diagnostic strategy is black and white. Fuel pressure is 9-13 psi. 7L/7. 4 out of 5 stars. 4L See more product details. The spacer increases cfms slightly by raising the pods out of the bores. It's meant to temporarily take place of the fuel filter, IMO. Then you need to soften the spring a bit. Start and run the engine, observe a fuel pressure between 12-15lbs.  · Chevy Forums FREE technical assistance for your restoration and repair. New Fuel pump relay 4. Fuel pressure is a little low, check the pressure regulator, and the fuel filter Aug 5, 2020 · Fuel Pressure Regulator Service Kit - Compatible with 1986 - 1995 Chevy S10 Features: - Meets or exceeds OEM specifications - Rigorous quality control measures Compatible With or Fits: - 1988 - 1995 Chevy S10 4. 9-13 PSI Key On Engine Running. WARNING: To reduce the risk of fire and personal injury, it is necessary to relieve the fuel system pressure before connecting a fuel pressure test. I will be using an aftermarket fuel pump and regulator and i need to know the req'd fuel pressure to make this thing happy. -Truck ran great 3 days ago. User Info. I just had this same problem with my 92 K 1500. 7L Vortec 0411 Swap to Dec 14, 2008 · Jet Performance 61510 TBI Fuel Pressure Regulator Kit . The simple design is low cost to CNC Machine. It screws in tight and will turn the spring perch easily without unscrewing itself, but I think I will epoxy in the thumb screw for added security. 96. fuel pressure. Aug 19, 2024 · "When the fuel pump is running, fuel is delivered to the injector(s) and then to the regulator where the system pressure is controlled to about 62 to 90 kPa (9 to 13 psi) on 4. May 23, 2005 · Orion Motor Tech Fuel Pressure Gauge, Fuel Pressure Test Kit Fuel Injection Tester with 0-140psi Fuel Gauge Hoses Adapters, Gasoline Pressure Tester Fuel Injector Tester "Hey - this thing worked perfectly to replace my fuel filter on my 1992 Chevy Suburban (had since it was new). 26,989 Satisfied Customers 07-21-10 11:33 AM - Post# 1948757 OK, I have the Holley 502-6 TBI in the mailWhoo hoo. 5~ PSI. www. reg is on highest setting. 56 $ 25 . There is NO pulse from the injector wires (using a timing light clipped to leads). check it again with the map sensor disconnected and vacumn line plugged. So as ive read here and in the instructions the proper fuel pressure is 13 PSI. Added to Cart. 1974 Chevy/GMC Truck, '90 TBI 350, '7427, TH350, NP203, 6" lift, 35s. CFM Technologies sells and manufacturers Magazine + TV Featured performance parts for GM TBI , Throttle Body Injection, along with custom carburetor spacers and the famous HVH Super Sucker Carb Spacers. New Fuel pressure regulator 5. 3L, 5. 7 TBI Fuel Pressure Regulator (Topic#203809) Koolhand233 Forum Newbie Posts: 18 Loc: Maryville, TN Reg: 11-23-08. ) The fuel pressure gauge will register 0 PSI. Shop Now at the Guaranteed Lowest Price! Rated 1 out of 5 by Astro from Be prepared to modify I bought this for a 4. ebay. I pinched off the fuel return line to the tank and the fuel Detailed repair manual for the 1991 Chevrolet Camaro RS V8-305 5. 55. A small amount of fuel may spill when disconnecting fuel hoses. —I’ve tested pressure at fuel pump with one end pluged at fuel pressure gauge. How Do I Test The Fuel Pressure On My Chevy 350 TBI? To test the fuel pressure on your Jan 8, 2021 · Generally, a 1-psi change in fuel pressure—from 11 to 12 psi, for example—can be worth roughly an additional 4 percent fuel flow. 7. Oct 14, 2023 · Hello everyone, my first post! '94 5. I have a 1992 k1500 5. Used fuel injector wire connecters 6. It wan't idle or rev above 3000rpm. Fuel pressure is regulated by a diaphram type pressure regulator located in the rear of Jan 25, 2018 · Inspect the TBI Unit: Look for visible signs of wear or damage. Web 67 Dec 29, 2011 · The GM TBI throttle body has the pressure regulator built into it. They do make adjustable regulator kits. These late-'80s and early Oct 7, 2018 · Until you verify the pressure don't assume that it is not a fueling issue. You have to get a special adapter to be able to put a fuel  · Post: desperate for help 1989 chevy tbi won't run (Topic#218145) motroo Forum Newbie Posts: 50 Reg: 05-29-09. There is 10+ psig of fuel pressure downstream of the fuel filter and you can hear the pump running in the tank. Under load, the pressure should remain stable. Thread starter squaredeal91; Start date Oct 31, 2023; Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. Problem solved. 8L V6 Jan 13, 2010 · I see a lot of questions on fuel pressure here. The 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board: Ok finally done a fuel pressure test on my 88 tbi truck. 7 4X4 TBI 99' Dodge Grand Caravan 3. 08-12-05 05:13 PM - Post# 759284 Jan 8, 2021 · Tips for adding power to a throttle body injected (TBI) Chevy 305, 350, or 454 V-8 engine. Max pump pressure means very little, but the flow matters. 684 W (centimeters) A-Premium Set of 2 Fuel Injectors Compatible with Chevrolet Tahoe, Blazer, Caprice & GMC Yukon, C1500 & Buick Roadmaster & Cadillac Brougham After messing with my brothers 1992 454 TBI dually truck and now my 1991 TBI 454SS, I am going to say, I am not a big fan of the 91-95 GEN V big block engine. MUCH better pump than the EP386 TBI pump. Home. Also you must upgrade your fuel pump before considering the spring. I had to grind the bottom edge of black cylinder, as well Oct 14, 2013 · The thread was called "Vacuum Adjustable TBI Fuel Pressure Regulator" that had a statement in "There was a guy here awile back who dialed in fuel pressure on a TBI on bench with air pressure. Keep in mind the truck did, and still does, run fine and gets decent mileage (15 mpg). The Chevy 350 TBI vacuum line diagram typically includes lines for the intake manifold, throttle body, fuel pressure regulator, PCV valve, EGR valve, distributor advance, and power brake booster. Jan 23, 2013 · Fixing this car for a friend, its a '95 TBI with 197,000 miles and she has been having intermittent stalling problems. Durability: The 350 TBI engine is known for its robust construction, which contributes to its longevity. 1-48 of 103 results for "tbi fuel pressure tester" Results. Share this product . A significant drop in pressure during acceleration can indicate issues. This is the first step to optimizing the TBI, without doing any grinding or machining; which will further increase the TBI to a max of 46mm (600cfm) That spring is the fuel pressure regulator spring. 7 TBI that's just gone through a frame up restoration, drive train is all brand new, fuel filter, fuel pump, TBI Rebuilt Kit, etc. An o2 can show lean from an exhaust leak, or un commanded air from a faulty diverter valve from the smog pump(if you have it) being stuck and sending air to the If the fuel pressure drops more than 1 psi under 8-10 seconds of full throttle the pump should be changed and dont put the stock TBI pump back in even if your engine is stock. This usually means that a lack of fuel IS Dec 31, 2011 · 1- The 95 Tahoe is the oddball and has the Vortec style (plastic cased) pump in it with a bit higher pressure than the regular TBI. These engines will start and run with low fuel pressure but can exhibit drivability issues.  · 87 chevy silverado 4x4 305 bored 30 over tbi Edited by 87bigboy4x4 on 02-20-16 05:27 PM. Oct 31, 2023 #1 squaredeal91 Full Access Member. 1K views 20 Technically, TBI fuel pressure should "slightly increase" when rapping on the gas pedal or the motor is going into a heavier load condition. Fuel pressure should be a constant 10 – 15 PSI on a TBI fuel injection system and is typically around 12 – 13 psi. 7L applications. Post: 1990 7. They only run around 9 to 12 lbs. Well, the pump is brand new, the regulator is new and so is the fuel pump relay! The car runs fine. It's a bummer that GM didn't make it very easy to check fuel pressure on the TBI systems like it is on the TPI systems, but if you're going to keep the vehicle, it's very much worth it Oct 15, 2024 · The cheap and easy was to do this is to install a old Carter AFB carburetor. Use the current ignition system. $4. Chevy Silverado EV Forum 4K members. Free Shipping - JET Adjustable TBI Billet Fuel Pressure Regulators with qualifying orders of $109. most are set around 12-16 and should never move from where its set. The fact that the truck will crank but no fuel comes out of the injectors also leads me to a fuel pressure issue (this can also be ECM related, but my instinct is the fuel). Checked the fuel pressure, good, 4 days ago · Thanks to Woody I am learning the chip burning and tuning part of things. 90. 99 delivery Mar 12 - 14 . The fuel pump can be powered two ways on these silly things. SNORE, AZOP, and SADR class 8 Chevy - 372sbc/th400/14bff - The big DOG I spend most of my money on beer, women, and racing. You could have dual tanks with two perfect fuel pumps and still have low fuel pressure. Chevy Silverado Forum (GMC Sierra) Member Introductions General Chevy & GM Tech Questions Chevy Suburban Forum (GMC Yukon XL) GM Powertrain. Shifts smooth, more power, increased fuel economy. Estimated  · Chevy Forums FREE technical assistance for your restoration and repair. The computer is supposedly on a different baud rate as well. Nov 8, 2001 · I recently installed a new fuel pump in my 87 k5 with a swapped in 454 TBI thinking it would hepl with my fuel pressure leak down. Ratings Price Brand JET Performance 61500 - Adjustable Fuel Pressure Regulator 1987-95 GM Truck 4. Google tells Oct 6, 2014 · TBI Fuel Pressure Web 67-72chevytrucks. chevymotocross Newbie. Higher pressure than 15 psi indicates  · Chevy Forums FREE technical assistance for your restoration and repair. 5 on TPI/MPFI with stock regulaters. I recommend Mar 31, 2014 · Now that you have confirmed that the 'no-start' problem is due to a lack of fuel, you now need to actually confirm how much pressure the fuel pump is producing with a fuel pressure gauge. 1. Just trying to verify if this is correct? It appears the pickups were in the 9-13 range? And there are other systems in the 50-60 range? But haven't seen anything listed @ 30 psi. 1998 7. 88 2500 350 TBI Fuel Pressure Check (Topic#285619) saxe101 Forum Newbie Posts: 6 Reg: 08-14-12. ‘87 454 TBI, NO Fuel spray, HAS fuel pressure, has 12v Mar 19, 2022 · There are two linked; the first one is way too long to go behind the TBI. The pump will probably have enough volume, but the pressure will be too high without a regulator. TBI Series Fuel Pump Flow Chart Aug 9, 2015 · Hello, on my 1992 454 motorhome, when i turn the key to on position the fuel pressure builds up Normal 1990's GM TBI fuel pressure is 12-14 PSI. 3 Flex Fuel 95' Pontiac Bonneville 3. turning up the fuel pressure seemed like a good idea at teh time, but now that I realize what I did, I think it was a horrible mistake. Mar 23, 2016 · Get the Best Performance with JEGS Billet Adjustable TBI Fuel Pressure Regulator Fits: 1987-95 GM truck (4. Take it for a test ride to see if it goes away. These are the replacement pumps for our PA and GPA Series in-tanks pump kits. The rest I just waste. Idle and high idle. Fuel pressure should be constant and not vary with engine rpm or load. Normally the truck runs great, but at the moment it has a blown head gasket. The tbi is rated at 9-13 psi from the factory, but with some modifications, they run better at around 14. Put the 1996 Vortec EP381 pump back in. In conclusion, the Chevy 350 TBI is a Jun 26, 2023 · It reads correct pressure but only when lines have leaked out the fuel everytime I took off to see if it was clogged I took everything apart even unscrewing the pin inside nipple valve and the gauge looked clean. There is +12v at one pin of each injector connector with the key ON. Joined Sep 14, 2024 · Key Features. It can be electrical, like low spark, but the fact that it needs to be primed leads me to believe it is fuel pressure. Reason for edit: No reason given. Mar 31, 2014 · Your fuel pressure gauge will register one of the two following results: 1. it is a single wire O2. Operation CHARM: Car repair manuals for everyone. But suspect it is still bad. stock. I recommend upgrading to the 1996 Vortec 155lph fuel pump which can support up to 450hp and plugs right into a factory TBI sending unit. Remanufactured. Post: Only 7psi fuel pressure; 89 350 TBI, pump? (Topic#109345) dragula Member Posts: 10 Reg: 06-04-05. 7L Vortec 0411 Swap to RoadRunner Sep 26, 2022 · In photo 1 of 2, you can see how the fuel pressure tester's adapter connects to the fuel fuel filter. 9K views 13 7. Send Private Topic View Profile. tbi fuel leak (Topic#200266) FMFNOFEAR Forum Newbie i feel dumb now so i Nov 6, 2014 · The fuel pressure regulator is in the TBI unit. Here are some web sites showing fuel pressure test equipment. The fuel pressure regulator springs break. Check your EGR, Disconnect the vacuum line and plug it. Jump to Latest 6. I squoze the return line with pliers for an instant while the engine was running and fuel pressure instantly shot to max on the dial. I had problems with my TBI when my motor reached operating temp the fuel pressure would drop and give me a lean condition. Bad Acceleration. ; Fuel Efficiency: With the TBI system, this engine provides better fuel efficiency compared to previous carbureted versions. Install a "T" into the line and attach a suitable 0-25lb gauge. 208 H x 5. V. NO LEAKS. Search Fixya. No issue. . It may be better to see about swapping in a pump made for a TBI system, I'm not sure how much of a drop a pressure regulator can do. " Read more It made it easy to fine tune fuel Feb 11, 2024 · 1987 Chevy R30 454 TBI 75k mi I bought the truck not too long ago and after redoing the entire brake system and ran flawlessly. o. Jan 15, 2021 · Buy Fuel Injection Pressure Regulator Diaphragm Kit - Compatible with 1988-1995 Chevy C1500: Pressure Regulators - Amazon. As I said, the truck normally runs great. Product Q&A View Now. Yes, we will need actual fuel pressure to give you better advice. Feed a healthy 6. —I’ve also disconnected tbi fuel line and check pressure there and also keeps 10-15 psi as well. 3L, 305 and 350 heads are just awful and you will never make enough power to utilize that fuel pressure. Customer: i have a 1990 chev 1500 with 5. Tighten gauge in line to insure no leaks occur during testing. scottm Well-Known Member. 09-15-12 10:49 AM - Post# 2269924 If you want to test fuel pressure: Your specific TBI doesn't have a fuel pressure port. Fuel pressure should Oct 18, 2023 · What Is The Normal Fuel Pressure For A Chevy 350 TBI? The normal fuel pressure for a Chevy 350 TBI is between 9 and 13 psi. Nov 29, 2019 · However, if they ARE opening and there's no fuel to release because the fuel pump isn't running, it probably has something to do with the fuel pump relay. 5PSI. from 250hp to 260hp the fuel pressure should be bumped up to 13-14psi May 8, 2012 · The stock 220 TBI on a GM 305/350 flows 480cfm (42mm). Reply. I ended up installing a second inline fuel pressure regulator on the return line to keep mine at 14 psi. Shop Fuel Pressure Regulators at Summit Racing. 4L TBI fuel Pressure spec is double what the small block needs. This is especially true for vehicles that came with the low-pressure fuel pump that suited GM TBI applications, but simply due to the age and pressure capability of these pumps it is a wise choice to do so regardless of the original fuel pressure Sep 5, 2024 · A '95 454 is a higher-pressure TBI system. I tested the fuel pressure coming out of the tank and got only 6. 7L TBI low fuel pressure. Add To Cart Feb 18, 2024 · Getting your next Chevy build just right is important, and since the fuel and air delivery system is going to impact just about everything you could plan on doing with your engine. 0L VIN E TBI. tbi fuel pressure tester adapter SET ACDelco FOR CHEVROLET TBI Fuel Pressure Regulator Cover 220 Throttle Body. Joined Feb 7, 2005 Posts Aug 24, 2015 · The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1988 - 1998 GMT400 Chevy & GMC Pickups Message Board TBI Fuel pressure Web 67-72chevytrucks. any ideas, thanks  · Chevy Forums FREE technical assistance for your restoration and repair. Oct 11, 2014 · The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board TBI Fuel Pressure Web 67-72chevytrucks. Skip to. You were definitely way above recommended fuel pressure with that pump. and all the parts used were AC Delco. I read on a website that the stock TBI fuel pressure regulator is only set to 12psi and after minor mods it runs lean. Email Report 87bigboy4x4 Forum Newbie Posts: 13 You can use a fuel injection pressure gauge, along with a special adapter to read fuel pressure. Fuel Pressure Regulator, 10-20 psi, Chevy, GMC, V6, V8, Each See More Specifications | Check the Fit. The second, smaller unit is located under and behind the  · Chevy Forums FREE technical assistance for your restoration and repair. 10 psi is slightly lower than I would like to see , but will not cause a lean condition, this is more than likely going to be from a vacuum leak , easiest way to check for a leak- withthe engine idling, take a can of carb cleaner with the straw attatched Nov 30, 2024 · Chevy Forums FREE technical assistance for your restoration and repair. Browse Categories Answer Questions . After the vehicle is shut off is the pressure suppose to hold steady at the rated pressure? when i turn the truck off the pressure drops rapidly to 3 psi after stalling around 6psi. Opens in a new window or tab. Tbi 350 lean -solved . 6. lifted, 35s, 355 tbi Whipplecharger, Doug's Headers, TH400 Email Report someotherguy Senior Moderator Posts: 29847 Loc: Texas Reg: 08-01-03. The second, much shorter one, fits fine behind the TBI. If you turn the key on, you can hear the fuel pump come on for a few seconds, and then it shuts off, along with the fuel pressure, until you turn the key into the start/cranking position. 00 Add to cart; Harris Tuning Flashlight $ 15. Checked fuel pressure on ignition on and reads 5-6 psi. I bought an adjustable fuel pressure regulator from cfm-tech to increase the pressure. 6 out of 5 stars. With this in mind, you are probably wondering what years did Chevy use TBI, and how this may impact your project and the performance you end up achieving. Pretty sweet setup he made from parts laying around. If the fuel pressure drops slightly (less than 5 psi) and then stabilizes, the system is operating correctly. Price, product page $7. 8 it’s losing fuel pressure after prime. 0L with the same pump in an 87 G20 as well. When active the map sensor lowers the fuel pressure about 1 lb for every 2" of vacumn. I am running 2 and building a 3rd tbi with 60psi pump. Fuel Jul 7, 2021 · Here are 7 symptoms of a bad GM TBI fuel pressure regulator. Jump to Latest I got a 94 full-size blazer with a 350 motor with tbi. 4. ) The fuel pressure gauge will register 12 PSI, or 2. Jump to Latest E3902 89 Chevy G20 Van 350 TBI --35 ----- 12-17 So, what's surprising to me is that the 350 (same for the 454) provides less flow than either 4 cylinder pump. Jul 25, 2021 · Hey fellas - Got a no start condition on my '94 TBI 350. 96 6 left in stock Edelbrock 3704PK - Small Block Chevy T. Jul 4, 2007 · With TBI the fuel pressure only needs to be 10-15 with 12-13lb's normal. Save Sep 3, 2014 · Your fuel pressure needs to be between 9-13 psi. Forums. B. 16 product ratings - SET ACDelco FOR CHEVROLET TBI Fuel Pressure Regulator Cover 220 Throttle Body. l4275. Or fastest delivery Mon, Mar 10 . Greg Sep 17, 2010 · 1988 silverado, tbi 350 has 12 psi fuel pressure, replaced oil pressure switch and fuel pump relay. -After it's done priming it Mar 21, 2020 · 1. PJG1173. com Find many great new & used options and get the best deals for Fuel Pressure Regulator Service Kit-Press Regulator Kit(w/TBI Fuel Meter Cover) at the best online prices at eBay! Free shipping for many products! Jun 15, 2023 · I have an '88 Chevy 1 ton with a Stahl service body on the back. This pressure may vary slightly between models. 9-13 is spec for small blocks. Chevy Forums FREE technical assistance for your restoration and repair. Feb 1, 2020 · Chevy Silverado Forum (GMC Sierra) no fuel out of TBI. 0L/5. 07-18-15 04:55 PM - Post# 2562541 Fuel getting all the Feb 16, 2005 · Chevy TBI's usually take around 15 psi, EFI motors take 35-45 psi. Jul 19, 2019 · TBI fuel pressure regulators don't hold pressure after turning off the key. 7 tbi, my fuel pressure gauge is showing 8lbs of fuel pressure coming right out of the pressure line going to the throttle body, truck runs ok for the most part but im getting a lean code and the truck spark knocks alot under a load. Thread starter chevymotocross; Start date Mar 10, 2009; C. Nov 10, 2020 · I guys, having a hard time finding what my fuel pressure should be on my 1992 GM topkick with a 366 TBI. 3 W CPI Astro van for years in my G20 van with both a TBI and TPI setup. Related products. Drove 60 miles. If you use a higher pressure gauge, you will lose resolution. sntrym95 Member. It is a 350 with TBI. These are feed side pressures and should not change with rpm or load. 1982 Chevrolet S-10 Sport 2006 Pontiac Solstice 2017 Subaru WRX. _____ 06 Hurricane 34FT WH W20 Chassis 8. Truck has been running fine and getting 15 mpg. Spray pattern looks good. items in my cart: 0. New Fuel filter 3. c10 I'd put the gauge on and read it before and after. Not Yet Reviewed. Truck is original and last year developed a miss/bad idle in gear. 4 out of 5 stars 16 ratings | Search this page . com: User Name: Remember Me? Password: Home: Forums: Gallery: Site Merchandise: Register: FAQ: Members List: Subscribe: Calendar: Page 1 of 2: 1: 2003 Chevy Z71 Tahoe 190,500 miles 2002 Chevy Silverado 1500 4x4 230,000 miles 1987 custom built Silverado 4x4 435,764 miles Jun 29, 2007 · Fuel System Checks Fuel Pressure is critical to the operation of a fuel injection system. Part Number: SUM-CSUMECCPF403. You don't want to see more than 10-11 psi, TBI is a low pressure injection, it uses about twice the pressure as a carb and certainly a lot less than TPI's nearly 50 psi. I am certain the fuel pump is good now. This confirms that the cause of your Mar 5, 2025 · Author Topic: FUEL SYSTEM PRESSURE TEST CHART A-6 (TBI) (Read 6301 times) VileZambonie.  · 13PSI fuel pressure, good pattern from injectors unless MAP connected, 60PSI oil pressure, temp is 1/4 of the way on gauge, alternator charging fine unplugging O2 makes no changes in how it is running, with or without MAP. What should be the fuel pressure directly out of the pump, I have 11psi directly out of the pump? Checked pressure before filter. MotorTrend Staff Writer Jan 08, 2021. 89 Chevy V2500 Suburban. 4 3. I'm running an inline TBI fuel pump made for this motor. I ran a delphi pump for a 92 4. Tags engine swap lean tbi 350. One is by the ECM turning on the fuel pump relay, and the other is by power going through the oil pressure switch. Could the the fuel pump be the problem? Nov 27, 2016 #2 S. 90's TBI 350 Chevy v8 injectors won't spray (Topic#326727) maherc84 Forum Newbie Posts: 1 Reg: 07-18-15. Here is the answer--the T fitting stays on the rig 18 PSI TBI Regulator Spring. good vacuum to MAP, no found vacuum leaks anywhere. 26-32 is spec. Install a universal adjustable fuel pressure regulator that will output as low as 1. Global Moderator; CHART A-6 - FUEL SYSTEM PRESSURE TEST Circuit Description : When the fuel pump is running, fuel is delivered to the injector(s) and then to the regulator where the system pressure is controlled to about 62 to 90 kPa (9 to 13 psi). 8. -When I turn the key to run, the pump primes, and I get about 12 PSI of fuel pressure. Send Private Topic The TBI fuel pressure specification for small block Chevy’s is 9 – 13 PSI with the truck running. Had to make trip into the city for TBI gasket, FPR hose, and a special tool to get FPR spring clip on, which took half a day. These will let you know if the injectors are not firing, or the fuel Oct 19, 2020 · JET Performance Adjustable Fuel Pressure Regulator 1987-95 GM Truck 4. For this test go to: TEST 1: Fuel Pressure Test With Gauge. Here is photo of a fuel pressure regulator Jun 8, 2006 · hey whats up, can anyone tell me how to adjust fuel pressure on gm 88 p/u,tbi 350, w/adjustable fuel pressure pressure regulator. Clean steady idle, no vibrations, no misfires etc. 2- It's just the regular old TBI style pump. 95 delivery. Joined Mar 10, 2009 Messages 10 Points 0. TBI systems don't have a schrader valve (like a tire valve) on the fuel Nov 27, 2012 · Fuel pressure psi for 1995 Tahoe tbi. It No more removing your fuel filter - no more climbing underneath your vehicle - no more hassle - when checking your GM tbi fuel pressure!!! We've asked several gauge manufacturers for years to make an easier way to check fuel psi for the GM tbi engines. Add to cart . Aug 3, 2012 · 94 chevy blazer tbi question. 1L 132K, Steersafe, Koni Shocks, DIY Trac Bar, Tri-Metric 2025RV Battery Monitor, 4-6V Batteries, Scan Gauge 2, Crossfires, 735W Solar Morningstar MPPT-60 Aug 8, 2015 · I pinched off the fuel return line and it still does it. 1998 GMC Sierra TBI 220 Fuel pressure regulator change 1 Jul 6, 2014 · (it's factory set at the lowest setting or close, which provides the least amount of pressure) I ended up drilling and tapping that assembly for a 10-32 screw and installing a matching SS thumbscrew. Look for a vacuum leak, and check fuel pressure at the TBI unit (you need to install a special fitting right at the tbi to read fuel pressure, get it at the parts store). ; Customization: A vast availability of aftermarket parts makes it easy to upgrade and customize the performance of the 350 TBI Find Parts and Accessories gm tbi fuel pressure adapter KEYWORD and get Free Shipping on Orders Over $109 at Summit Racing! Shop the CLEARANCE SALE! Pro-Flo 4 and FAST Swap Kit for GM Gen III LS Combo, 24X, Chevy, Kit. How is Common faulty TBI parts: Fuel pressure regulator: This component regulates the fuel pressure within the TBI system. 7L Auto ECM 1227747 $42! 1998 Chevy Silverado 5. Part Number: 561-61500. Buy It Now +$6. CASE 2: The engine did not start, not even momentarily. The first tool  · The gauge and adapter gives an accurate fuel pressure reading when installed at the TBI inlet. Try again! Details . 8K views My engine was missing an edelbrock 1406 carb and an HEI. Jul 12, 2020 · I can say that for mine, it only held pressure for a few seconds. It should be 62-90 kPa (9-13 psi). Injectors: The injectors are responsible for spraying the fuel into the intake manifold. I pinched off the feed line after it builds up and it still drops after the pump turns off. The pressure on TBI should be 13 psi and 43. 8 NA Jul 21, 2022 · If you are getting a decent fuel flow, the pressure is likely sufficient on a TBI setup, as it's a low pressure system. Chevy C/K Truck Forum 1994 C2500 5. m4383. I Performer Power Package 1987-1995 Small Block Chevy TBI 305/350ci (EGR) (0) $801. Walbro pumps are the highest quality Hi-Performance pumps available today. Aug 6, 2022 · 5. Jump to Latest 8. Used fuel injectors (from junkyard may not be in working condition) 7. com FREE DELIVERY possible on eligible purchases. I'm thinking 20-ish psi is low. Examine Fuel Pressure: Use a fuel pressure Aug 5, 2019 · Chevy Truck Tech Forums. etc. need to These are the real deal. 00 Add to cart; OBD2 Pcm LS1 Simple flash Apr 17, 2024 · The fuel pump has a backup function which will energize the fuel pump if there is oil pressure. Mar 23, 2019 · TBI Fuel Pressure Regulator Kit; 1987-1995 C/K Truck/SUV 4. 3L/5. Model specific subject matter experts, classified ads and more. Clamp the fuel return hose shut at the throttle body. $119. Jan 27, 2013 · I've finished the CAD for a Vacuum Adjustable TBI Fuel Pressure Regulator. The fuel pressure regulator is positioned after (downstream) from the injectors, Oct 2, 2012 · * Use a 0-15 or 0-20 PSI gauge for TBI, which will normally yield a ~1/2 to 2/3 of full scale reading (~11 PSI). That doesn't sound like much, but going from 50 to 52 Oct 7, 2018 · Until you verify the pressure don't assume that it is not a fueling issue. once I Jun 19, 2023 · TBI fuel pressure? Jump to Latest Chevy small block with throttle body fuel injection, what fuel pressure do I need to operate correctly 🤔 Lets you run a fuel system designed for an LS/e85 But save the engine swap till the TBI dies so your not cutting corners. Free returns. This mechanical 1-1/2” (38mm) 100 PSI Chevy TBI Fuel Pressure Gauge doesn’t require a power source or wiring. Items You May Also Consider. Feb 3, 2019 · I replaced the fuel regulator in the TBI. This seems to have stopped the lean condition. While rebuilding it I installed a fuel pressure sensor post fuel filter and at idle its 10. $56. 3 tbi in a Chevy Astro. Lower manifold vacuum will create slightly higher fuel pressure which is considered normal. i have been trying to solve a mid-high end sag issue at WOT Mar 10, 2009 · 305 Chevy TBI Low Fuel Pressure. hook up a fuel pressure gauge and see if the pressure drops when the motor falls on its face. An early sign of a bad GM TBI fuel pressure regulator is bad acceleration. There are ways of bumping your fuel pressure up for free in a TBI if the regulator spring is weak. com _trksid=p2385738. 56 0:36 Dec 20, 2023 · All you have to do is add the Chevy TBI Fuel Pressure Gauge Adapter to the port, and then thread the LS Fuel Pressure Gauge into the adapter. 1998 Chevy Silverado 5. also after the engine is hot and parked for awhile it wont start it acts like it floods out. It is one of those two. Fuel pressure. Thread starter Navarino; Start date Nov 13, 2016; I have issues with my 1995 Tahoe TBI 5. New Fuel pump 2. Sep 13, 2006 · Buy JET 61500 TBI Billet Aluminum Adjustable Fuel Pressure Regulator: Pressure Regulators - Amazon. Test the Sensors: Verify that your sensors are functioning correctly, especially the temperature and throttle position sensors. Turn the ignition to the "OFF" position. Jump to Latest 4. 4L applications the pump will deliver system pressure that is controlled to about 179-220 kPa (26 to 32 psi). Usually you need to loosen the fuel line bracket at the bellhousing to move the line back a little bit, install the fitting, then tighten the bracket back Jan 29, 2007 · When I swapped the injectors from the 350 over to the 305 throttle body, I turned the fuel pressure adjustment up quite a bit. 4 w/TBI loses fuel pressure (Topic#376061) fxrtharley Newbie Posts: 3 Reg: 11 The factory fuel pump in GM TBI vehicles was a low-pressure pump, providing only about 20 PSI. 5 Jan 1, 2008 · 0-140PSI Fuel Injector Injection Pump Pressure Tester, Fuel Pressure Tester Kit, Universal Fuel Pump Pressure Tester Gasoline Car Truck Motorcycle Diagnostic Tool 458 $25. 4 fuel pressure, pump, tester questions (Topic#182063) someotherguy Senior Moderator Posts: 29847 Loc: Texas Reg: 08-01-03. It does not hurt Mar 31, 2022 · I have a 1991 Chevy s10 2. 3L/305/350/454 TBI. On 7. If you lower the pressure it will flow less fuel when open the same 1 second Aug 30, 2022 · Chevy. 109 lph fuel pump - For OE GM Throttle Body Injection. Jegs has one for around $50 Dec 1, 2021 · The fuel pressure will greatly effect how much gas your getting. If the  · Post: TBI 7. 99. * You can Aug 5, 2019 · Sometimes I have to squirt fuel down the throttle body to start it. 4 fuel pump/pressure - in a bind (Topic#223221) someotherguy Senior Moderator Posts: 29847 Loc: Texas 89' Chevy 1500 5. Free Shipping; $4,634. 0-140PSI Fuel Pressure Gauge Kit | Fuel Injection Pump Pressure Tester Gauge Kit, TU-114 Oil Pressure Tester Tool for Motorcycles Cars Trucks. I learned that with my simple modifications, it's good to add the adjustable fuel regulator to bump up the pressure a bit. We only rely on Genuine Walbro / TI Automotive fuel pumps. My question, is there different fuel pressures that Crusader or Chevy used on different models?  · Fuel pressure is ~12psi I just replaced the fuel pressure regulator diaphragm and cleaned the screens on the injectors. 4 l dually, I have just replaced the TBI injectors and fuel pressure regulator, Tim's Auto Repair | Have owned a repair shop for 25 yrs. The fuel pressure test fitting I have is long and is used in place of the fuel filter. The big variable is fuel pressure. If you click them and make a purchase, we may earn a small commission. Feb 13, 2012 · Fuel pressure The systems calculates the fuel needed based on the initial settings for injector size at a specific pressure. an injector will flow x amount of fuel at a given pressure when it is open say 1 second, if you increase the pressure it will flow more fuel when open the same 1 second. I expected it to be the contrary. My sources say that pressure should stay up even after two hours. Unlike the trucks the 87-96 TBI G-vans had decent pump wiring from the factory. Estimated Ship Date: Monday 2/3/2025. 4 days ago · It has dual exhaust, tbi spacer, injector spacer, and k&n filter. OK, now that the testing part is done, let's take a look at what your results mean: CASE 1: The fuel pressure gauge registered 0 PSI. Mine doesn't so, I asked R. 0 out of 5 stars. Chevy SUV & Crossover Tech Forums GlowShift -4 an Fuel Rail Fuel Pressure Sensor Thread Adapter Compatible with Chevy GM LS1 LS2 LS3 LS6 Engines. Small Business. When fuel pressure regulators go bad, it reduces the efficiency  · The TBI fuel pressure specification for small block Chevy’s is 9 – 13 PSI with the truck running. Email Oct 27, 2022 · There are two oil pressure measuring devices on the '87 TBI 350. Aug 27, 2005 · on my TBI system I had to set intial timing at O you said yours was at 10. Jan 6, 2010 · One thing that needs to be checked is fuel pressure, there is a regulator inside the TBI, if it failed the line pressure will be high and that will richen the mixture. Should be plenty. In theory, the regulator can handle the pressure, but you can flow enough volume to give the regulator problems. my truck is blowing black smoke at w. Check each product page for other buying options. 7 TBI with 145,000. JET Adjustable TBI Billet Fuel Pressure Regulators 61500 JET-61500. 5. If i let the throttle it dies. Sounds like its running great in open loop, then when the ECM goes to open loop, it runs like ****. 3- Use the modded TBI, just do the quarter trick with the factory regulator spring instead of the 18 psi spring. 3L/305/350/454 TBI $119. Jan 25, 2004 · I have a chevy tbi 350 from an 89 suburban. Your single fuel injector can be perfect, but if it is not supplied with enough pressure, it won't spray correctly Unlike the newer GM fuel injection, our TBI's don't have a Schrader test valve gauge port. If the regulator is faulty, it can cause excessive fuel pressure or a lack of fuel pressure, leading to engine performance issues. Always check to insure that you have the proper fuel pressure. Sep 11, 2011 · Chevy TBI's work fine with high pressure pumps, and will return un-used fuel to the tank, but you do have to set the pressure. Ships QTY . Brand: Jet Performance. I replaced the IAC, TPS and EGR, plugs, wires, cap, rotor, still had the problem. 3L/305/350/454) 159050 parts at JEGS. Removed a mile of wire, set fuel pressure, throw tbi in trash can, set timing, and boom. Chevy C/K Truck Forum. Connect negative battery terminal and START engine and observe fuel pressure reading. 5 psi where I heard spec is 9-13. 0-15 PSI Fuel Psi Guage with 1/8" NPT Fitting - Fits in our #500-200 Fuel Psi Adapter for GM Throttle Body Fuel Oct 31, 2023 · 1995 454 tbi fuel pump & pressure recommendations. I have a aftermarket fuel pressure regulator that I have from my old Subaru build that I Oct 21, 2017 · Fuel pressure regulator- pull the vacuum tubing off the fpr and if there is fuel, diaphragm is shot, Replace the fpr. And the pump keeps 10-15 psi. starts and runs 2-3 seconds and then shuts off? injectors are fireing good at start up then quit. TBI 4. Click image to zoom. 99 $ 7. Morse Machine (who made my VFPR) he said they don't, other members at GMT400 forum agree. t. 0L and 5. Would be good to verify with the service manual set for your vehicle that you should download from the links in the Sticky thread section of the Engine forum. Aug 5, 2009 · Ok finally done a fuel pressure test on my 88 tbi truck. 99. Any help would be appreciated Jun 29, 2007 · Fuel System Checks Fuel Pressure is critical to the operation of a fuel injection system. hjl sarlmuw maox fdrhz ofpd lbdq duxtytr umds ujiba revbi sssigsl djlmexi qsp joqbf hece