Question about 2001 Pontiac Firebird

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My fuel pressure is not holding how do i know if it's my fuel pressure regulator or fuel pump

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  • yadayada
    yadayada Aug 06, 2010

    DISCONNECT THE VACUUM LINE TO THE PRESSURE REGULATOR,THE PRESSURE SHOULD GO UP AT LEAST 5 POUNDS.

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MEASURE FUEL PUMP PRESSURE AT FUEL FILTER CONNECTOR. ATTACH PRESSURE GUAGE TO FITTING COMING FROM TANK. MAKE SURE THER ARE NO LEAKS FIRST THEN HAVE SOMEONT TURN THE IGNITION ON CK. GUAGE PRESSURE TURN KEY OFF PRESSURE SHOULD REMAIN CONSTANT SINCE PUMP IS DEAD HEADED ( NO RELIEF/ REGULATOR) IF PRESSURE FALLS ,PUMP INNER CK VALVE IS LEAKING. IF PRESSURE DOES NOT FALL THEN SUSPECT REGULATOR

Posted on Aug 06, 2010

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My 2003 S-10 sometimes won't start and backfires and you can smell fuel. After I get it started, it runs perfectly. Any ideas as to what it could be?


Well you know one thing, your air, spark, and fuel mixture isnt right at first start up. Sounds like a fuel pressure problem. Your fuel pump may not be hold pressure or fuel regulator on the fuel rail may need to be replaced. Regulators are pressure activated and use springs to regulate gas flow like when you start your car drive and idle. Also check for leaks or cracks in fuel lines as they can cause the same effect

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I have a 2004 ford sport trac and my check engine light it on. i tried reseting the computer it work for a day or two but came on. then had it check and its saying that something about bank 1 bank 2 that...


Don't think it would be the fuel rail, as that is only a pipe to hold the gas and the injectors. So if you have low pressure, it is probably either the fuel pump or the fuel pressure regulator. Wouldn't cost much if anything to have the fuel pressure checked. I believe Autozone or O'reilly's will rent those fuel pressure gauges, with just a refundable deposit.
The pump is doing something since the engine is still running. If your pressure is too low (below the specs for your truck), a pressure regulator is cheaper than a pump, so you may have to try both, first the regulator.
But first, pull the vacuum line to the regulator off and run the engine for a minute. Watch the regulator: if gas starts coming out the vacuum fitting on the regulator, then it is definitely shot and you need a new pressure regulator.
If the regulator is not leaking, check the fuel pressure. If low probably the pump, but maybe the pressure regulator. Ask the guys at autozone (or where you get the gauge to check pressure) how to test the regulator as you are checking the pressure.

Mar 29, 2017 | 2004 Ford Explorer Sport Trac

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When i go to start it for the first time it starts right up but after that it turns over for a long time before it starts someone told me it was charcoal filter on the return line do you think that is it i...


When you had the fuel pressure tested did it hold pressure with the key off or did the pressure drop off?

If it dropped off I would bet you have either a leaking fuel pressure regulator or a bad fuel pump. Fuel pressure needs to hold steady especially on a hot engine in order to prevent the fuel in the fuel rail from boil over.

I think the 99 has the external injectors. If it does the fuel pressure regulator is located on the drivers side of the engine about in the middle of the fuel rail. There will be a small vacuum hose attached to it. remove the vacuum hose and see if gas comes out. If it does the regulator is bad. If it doesn't I would check the pump next.

There is no charcoal filter on the return line or the pressure line. The charcoal canister is part of the evap emissions system and will rarely if ever effect the starting of the vehicle.

Mar 19, 2011 | 1999 Chevrolet Silverado 1500

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How to replace Fuel Injection Pressure Regulator on 2002 chrysler sebring


Fuel Pressure Regulator Removal & Installation To Remove:
  1. Spread tangs on pressure regulator retainer.
  2. Pry fuel pressure regulator out of housing.
  3. Ensure both upper and lower O-rings were removed with regulator.
To Install:
  1. Lightly lubricate the O-rings with clean engine oil and place them into opening in pump module.
  2. Push regulator into opening in pump module.
  3. Tabs hold regulator in housing.
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Feb 12, 2011 | 2002 Chrysler Sebring

2 Answers

The fuel pressure when ignition is off is 0. and the car takes long to start sometimes


With a fuel pressure gauge hooked up. the fuel pressure shoul d go up when you turn the key on. The fuel pump will only operate for about 2 seconds, then shut off again. The fuel pressure should hold steady for at least 5 minutes. If it does not hold, this is the reason for your hard start. It could be caused by a leaking fuel pressure regulator or more likely, the check valve in your fuel pump assembly. To find out which one it is, find a place in the fuel return line that is made of rubber and pinch the fuel return hose off with a pair of pliers. Repeat the fuel pressure test. If the fuel pressure now holds steady, your problem is the fuel pressure regulator. If it still drops, replace your fuel pump.

Jan 29, 2011 | Nissan Sentra Cars & Trucks

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I have1997 4.3 ther.body i trun key rolling engr over get 50 psi wen stop rolling eng over feul psi go to 0psi right now


Does the truck run? 50 psi should be enough to start the truck. The fuel pump my not be able to hold the pressure. You may have an injector stuck open letting the fuel pressure drop. It could also be the fuel pressure regulator. It is very hard to find those problems because fuel injectors and regulator are mounted inside the intake. If you can find a way to block off the return line of the fuel pump you can see if it then holds pressure. Then try to block off the pressure line right after cranking to see if the pressure holds. This will let you know if the pump is working correctly.

Jan 11, 2011 | 1997 Chevrolet Tahoe

1 Answer

How do i know if my fuel pump is bad


The only way to know for sure is to put a fuel pressure gauge on the pressure regulater valve. when yo tuRn the key on ENGINE OFF the pressure should run at 50 psi when you turn the key off it should hold pressure for one minute, if not the regulator is bad, or the fuel pump check valve is not holding and this is not good. So the pump has to e replaced.

Oct 04, 2009 | Oldsmobile 88 Cars & Trucks

2 Answers

FUEL PUMP MAKES NOISE PRESSURE GAGE READS 40 PSI ENGINE BEGINS TO SPUTTER MY PRESSURE GAGE DROPS TO ABOUT 20 PSI


Fuel pump is bad. At idle pressure should read 50 PSI. Replace with original manufacture fuel pump after market pumps will burn out fast and are unreliable from my experience. Also could have a bad fuel regulator but that only works while driving down the road full throttle. You can unhook the fuel rail pressure regulator and that will give it full fuel and the pressure reading should read 60 PSI while it is running. If you turn the engine off and turn the key to run position it should read 50 PSI and hold for 60 seconds, if it drops below 30 PSI after 30 seconds Pump is defective. Many pumps are going bad here of late as people have been running them less than ¼ tank and this kills the pump. The fuel cools and lubricates the pump so the lower the fuel level the worse it is on the pump below ¼ tank. Not to hard of a job to do if you want instructions let me know.

Sep 28, 2009 | 1997 Chevrolet Lumina

4 Answers

Low fuel pressure


U 1st need to test fuel pressure at the fuel pressure test port on the top of the engione in the fuel supply rail to the injector tops, it looks like a metal tire vale stem, u will need to buy a special fuel pressure tester to do this test. U should have around 55-60 PSI at idle, it should go up when u gun the engine but never go down, if it goes down the fuel filter or pump are suspect.

Apr 29, 2009 | 2001 Chevrolet Malibu

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1997 GMC 1 ton 4x4 hard to start after it has warmed up. changed fuel filter no help No code to be read We have notice that the fuel in the rail is vapor not a liquid. Is this normal and if not what would...


The fuel pressure should hold at or near the 45 lbs after you shut the truck off.
You have one of three problems causing this.
One, the fuel pressure regulator is leaking internally and allowing fuel to return to the tank via the return line. To verify, use a pair of pliers and gently pinch the return line off. Turn the key on to the run position, the pump will run for 2 to 5 seconds and pressurize the line. Watch the pressure gauge, it should hold pressure. If it does, change the regulator.

Two, the check valve at the pump is weak. To verify, turn the key to the run position, when peak pressure is reached, gently pinch the pressure line and watch the pressure gauge. If the pressure remains near the peak pressure the check valve is bad. Replace the fuel pump.

Three, if neither of the above procedures work, you have a leaking injector. You will want to remove the fuel rail, pressurize it to find the bad injector.

Any one of these failures will cause the "vapor" issue you describe.

Good luck, let me know what you find.
Regards,

Apr 28, 2009 | 1997 GMC Sierra

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