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I have 5 lbs fuel pressure with key on not starting. When started get 30 lbs running. When turn off fuel pressure gauge goes to 0. Is it fuel pump ,fuel pressure regulator, or filter

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I suspect the pressure regulator is not maintaining residual pressure. IT could be the regulator but I suspect that you have a leaking injector

Posted on Apr 08, 2015

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1 Answer

Fuel problems


Sounds like the fuel pressure regulator is stuck in the open position.I am trying to remember if this engine(Vortec?)has a return line to the tank.If it does,try disconnecting the return(smaller) line,and use something to plug the fitting on the outlet of the fuel on the intake(Use a piece of fuel hose and a bolt_make sure you use a hose clamp,as there is 50 PSI of pressure)

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I have a 1998 Plymouth neon that is hard to start. I hooked up a fuel pressure gauge. When you first turn on key pressure goes up from 0 to 2. If you cycle the key 3 or 4 times it will build pressure to...


It does sound like the fuel pump may have a problem, however, usually when they go out they completely fail and don't work at all.

I would recommend changing the fuel filter first, which is not too expensive. If that doesn't help, you probably will have to change out the pump.

Good luck!

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Fuel filter or pump. will start but will not continue. gage show 55 lbs of pressure when start, none when not key on.


Sounds like a pump. You should have 43 lbs of pressure after system is primed by turning key to ON. Pump will run for 5 seconds and shut off if engine is not running. It should hold pressure for 30 minutes with just a few lbs drop. If not, it is the check valve, internal to the pump or the fuel pressure regualtor on the fuel rail. Hardly ever the latter

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When you turn on ignition key fuel pump runs. when you go to start the pumps shuts off. i can use starting fluid and it starts. is it pump or pressure regulator


you need to verify fuel pump pressure at fuel rail with pressure gauge,you need at least 55psi of fuel pressure to fire up car.
the fuel pump is made to only run five seconds when you turn key on to pressurize fuel line for when you turn key to start,

Dec 30, 2009 | 1992 Cadillac Eldorado

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Have you checked the fuel pump relay with an ohmmeter/multi-tester? You will have to follow the power lines to find it. I would check the relay first. Then check fuel rail fuel pressure. It may be faulty fuel pressure regulator or a sensor. Is your check engine light on? If so, I would have the codes read to pinpoint exact problem location. Check your spark to make sure each plug is firing.

If you want more info let me know.

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I had the same problem with mine. I installed a fuel pressure gauge, and drove around until the problem started. The truck should be running between 48 to 56 lbs. of fuel pressure. Mine ran at idle at 42lbs. , not even high enough. Drove it for about 20 minutes, and it started to stumble. Fuel pressure dropped to 30lbs, 20 lbs - then all the way down to 2lbs. I shut it off, and it would not start back up. 30 seconds later, I turned the key and it came up to 10lbs. press. 10 more seconds 20lbs. After almost a minute, it came up to 42 lbs. started and I drove away. I replaced the fuel pump assemb. on 7/3/2008. Drove it around,and the problem is gone. Mine is a flex fuel, and the pump retails for $668.00. I did find a AC Delco pump for $221.00. I hope this helps.

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1 Answer

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You have a problem in the fuel pump relay circuit for sure then. I'm betting the relay, but it could be that dropping resistor.

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