Problems with vapor lock are most common on older vehicles that have a carburetor and a mechanical, engine-driven fuel pump. Generally the regulators don't fail. next would be to check fuel pressure. most likely your fuel pressure regulator,,, whe the fuel pressure regulator goes bad, it is worse when hot and after a short time of sitting then trying to start. CHEVROLET BLAZER. model 220 TBI dumping waaayyy to much fuel & flooding engine. Fuel related misfires can be caused from too much fuel. #1 · Oct 19, 2012. I am having low end power issues, along with backfiring until you get up to 3000 rpm. 680 posts · Joined 2005. TBI only runs at about 15 psi. In about 10 minutes we diagnosed a faulty pump without guesswork. The pump should run as long as the jumper is installed. Ship Date: Today. The engine will give strange sounds and cause engine vibration, especially when idling. 7L/350 Fuel Pressure Regulators V8 Engine Type and get Free Shipping on Orders Over $109 at Summit Racing!. The truck will idle all day but when I try to take off it sputters and misfires. 4L MPI Fuel Pressure Issue. some can leak back into the intake. with the engine idling. For ~2 seconds after the ignition is switched ON the fuel pressure should be constant and unvarying between 9-13 PSI, typically ~11 PSI. If the fuel pressure drops rapidly (to below 10 psi in one minute or less) a leak is present in the fuel supply system. 5 PSI with EP377 pump (Spring pressure specs to follow) One combination that works well for a TBI upgrade, it's the gold colored spring used with the EP377 pump. #1. It has been going on from the. SKU # 837548. We tested to the fuel pressure on a Chevy TBI. 3L/5. Product Q&A View Now. 3L Vortec, with 142,000 miles on it. 5-15's. -Static psi 120lbs. 1988 CHEVROLET TRUCK. Some of the most well-known applications are the V6 and V8 engines found in General Motors (GM) pickups. Activate the fuel pump to pressurize the line. Inspect for External Damage: Visually inspect the regulator for any signs of damage, such as leaks, cracks, or broken connections. James670X 1/2 ton status. Black Smoke Generation See moreChevy 350 tbi fuel pressure regulator symptoms can include engine hesitation, stalling, and poor acceleration due to fuel starvation. Turbo city actually markets an adjustable fuel pressure regulator for approx. If you have 15 psi of fuel it shodl only be 9-13 at most so it lmay be the regulator or a blocked return lineIs the fuel pump you installed a high pressure pump? If not and it's just a stock replacement pump they will only achieve about 15-16psi and nothing more. Get the job done with the right part, at the right price. 0 7. It came with a 5. no gas is getting to the carb. The cost of replacing a bad fuel pressure regulator varies from the region, the type of mechanic, and the nature of the FPR. 3L, 5. 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. As long as the fuel pressure is within the normal range, the fuel system is likely operating normally. Hi guys, I've been having a problem with my truck for quite some time now. i unplug the fuel pump relay. I need a diagram for a 1994 chevy silverado fuse box. Testing for Fuel Pressure on a TBI System. The Delphi diaphragm is made of nitrile, which. New Fuel pump relay 4. New Fuel pump relay 4. . . 1991. The vehicle being tested in this video is a 1995 Chevy S-10 Pick-up 4. Step One: Remove Power From the Pressure System. 7 TBI Fuel Pressure Regulator (Topic#203809) Koolhand233 Forum Newbie Posts: 18 Loc: Maryville, TN Reg: 11-23-08. It was only running around 9 psi. to use noid light you have to disconnect fuel injector electrical connector then plug. 1987-95 GM Truck 4. Key on engine off should be 55 to 62 psi. If one of these sensors’ values is out of the specified range, the check engine light will show up. I would have liked to run the truck for a while with the fuel pressure gauge, but couldn't because the damn gauge kit was so worn and abused it leaked fuel everywhere. How do i set timing on 1998 chevy truck 350 vortec. Question about 1990 Chevrolet C1500. 2 posts · Joined 2017. If you need more help to. Motor City Rick said: Fuel pressure must somewhat hold from 1 to 3 minutes after engine shut down (not less than 6 to 8 psi). It made the problem more noticeable. That would give you an idea what it should run like or you could just leave it that way. JET Performance Adjustable Fuel Pressure Regulator 1985-93 Camaro/Firebird 305/350 TPI. 4. Engine speed may vary up and down and disconnecting the IAC valve does not help. N. 4L TBI. Truck Model. 6—6. TBI fuel pressure regulators don't hold pressure after turning off the key. Everything ran great for about 200 miles, it was definitely WAY more fun to drive then when it was stock. JET Adjustable TBI Billet Fuel Pressure Regulators 61500 JET-61500. Make sure the injectors do not drip fuel when it is shut off. CJeep77 said: WRONG - tbi is 11 to 14 lbs pressure stock! A stock tbi injector can go up to about 30 psi though:flipoff2: This is absolutely correct. #1 · Aug 16, 2009. After doing math, it would be ideal if i could get a spring in the 20-30 psi range. Also. It will not start unless I pour fuel in the carb. I did a TBI conversion on my 77 350, and from what I remember the return line was smaller diameter. musicBetter Luck by tubebackr | promoted by 3. TPI needs more like 50-60psi. 350 TBI. Doing so will ensure that there is no power going to the fuel pressure. Order Chevrolet K1500 Fuel Pressure Regulator online today. 1992 gmc jimmy 4. Runs rough in midrange, actually slows down during part throttle accelleration. $4199. I believe that the ECM needs to see at least 4. problems as to why it was stalling and not idling correctly. Also it could be losing presure slowly. TBI) and swap the intake to a Carb one. 7 6. Chevy '91 TBI 350 surging at idle and stumbling at speed. Put the 1996 Vortec EP381 pump back in. 88's grizzly/spool, 39. One method involves using just starting fluid and the other involves using a fuel pressure gauge. 3L, 5. The fuel pressure regulator is set for approximately 12 psi (30 psi on '94 & '95 BBC trucks). A sooty spark plug could just mean the engine is burning oil at that cylinder. how can i check the IAC and fuel pressure regulator? 97 6. The fuel pressure regulator is set for approximately 12 psi (30 psi on '94 & '95 BBC trucks). 10 gears 200K miles. Also when we were down there we replaced the fuel filter. Read full answer. Next morning I checked fuel pressure, lowest reading was 11. V2500 Silverado Suburban. It's my first GMC ever . Use a gage and check proper fuel pressure. It is rare, but it does happen - fuel pressure regulator spring breaks into. Finding a shop with a GM Tech II to scan that thing would be. Replaced most of the vacuum lines. Swap the distributor and coil to an HEI unit. A tailpipe fuel leak is a sign of a bad fuel pressure regulator. Under Pressure. How to check fuel pressure on a general motors truck and what easy checks you can do to diagnose a fuel pressure regulator problemcheck out my other videosht. Try bending the rotor spring up to put a little more pressure on the carbon (hopefully) button inside the cap. Messages. 95 and back had the old low pressure tbi. The pump will want to throw 10-12 at it. They get in the way of the distributor. 7/7. Would. I'm thinking it's a distributor problem since it's not sending a signal to the comp to keep the injectors firing. Adapter fitting for GM TBI systems without a fuel access valve test port. Intake leak, injector and fpr leak can cause P0300 multiple misfire though. Jan 16, 2010. $65 which is really nothing more than the factory unit with a large adjusting screw! Thus I felt it neccessary to show my TBI bretheren the simplicity of performing this modification. Its a 4. 04 kB, 700x393 - viewed 820 times. i have a 1987 Chevy 1/2 ton 4x4 with a 5. 0. 2) Verify that the fuel pressure gauge is accurate. I would think comparing a pre TBI wiring schematic to what you have should give you an idea of what you need to do to keep the sensors working without the ECM. The symptoms of volvo d13 injector cup failure include fuel in the coolant, white smoke from the exhaust, slow engine start-up, and loss of engine power. If you crank it up too much, about 20 it will overwhelm the injector and flow fuel all the time. 5. You should check to make sure the regulator is doing its job. As for a fuel pressure regulator, my fuel system does not have one and the pump is designed for a tbi system with 15 psi. 1. The fact the engine will fire on a prime of fuel but not keep going is proof positive that it isn't getting fuel. #2. This should work on any GM that has a TBI. If there is continue. This weekend I put a new idle air control valve and o2 sensor in, and the symptoms still persist. 3BELTWESTY 8K SNYYes, too high a fuel pressure WILL cause a too rich condition, and your fuel pump is probably the problem. Was the spring broken? If the spring is broken the fuel pressure will be to low. High pressure pumps move a lot of fuel at 43 psi (port fuel pressures). 74 Chevy: 350tbi/400/205, 60/14 4. Runs rough in midrange, actually slows down during part throttle accelleration. Low fuel pressure will cause poor fuel delivery and what you describe as the spray pattern. Posts: 355. No issue. Replace it if necessary. Free Shipping. 3 ltr. 74 Chevy: 350tbi/400/205, 60/14 4. Excess fuel is then returned to the fuel tank. This can be felt as misfires on acceleration or even at idle. Click image to zoom. Leaking Fuel. Lightly lube the O-ring with clean engine oil before assembling the adapter. Runs rough in midrange, actually slows down during part throttle accelleration. Perform a Vacuum Test: Start the engine and let it idle. I think I have fixed almost all the random issues except one. It's a good thing to have anyways. With a service range of 9 to 13 psi being considered good. one pint for every liter of engine displacement is a good rule o thumb. #7 · Sep 12, 2014. In response to dragula. (with a return) Factory TBI pumps send 10-12 PSI. A few weeks ago the original fuel pump finally croaked just shy of 200K miles. The fuel pressure specs for a chevy 350 tbi engine is 9 to 13 psi. 350-3050. I'm pretty sure it's got a leak in the base gasket between the throttle body and the intake (which is common). The regulator will throttle it down to 6 psi, but you will burn up the. #1. 183 posts · Joined 2009. 12. #7 · Jan 25, 2004. Hogg. Since then it has grown to be a leader among full size Chevrolet K5 Blazer and GMC Jimmy web sites across the Internet. Used distributor stem with used cap and rotor and pick up coil or whatever the name is of the third part on the distributor Fuel pressure in line is good1335 posts · Joined 2007. Bad fuel pump, clogged fuel filter, fuel pressure regulator that is passing too much fuel at idle. Watching this video will help you diagnose to see if it is time to replace your fu. Simple test made difficult by the fuel line arrangement and lack of decent aftermarket. I have replaced fuel pump,. The pressure regulator is on the throttle body, you would have to check fuel pressure to tell if it's working. To test the regulator, with engine at idle, pull the vacuum hose off the regulator. In May of 1999 CK5 started out as a tribute to America's favorite 4x4 utility truck. com the video, 1A Auto shows how to remove and replace a faulty fuel press.