Question about 1994 Jeep Grand Cherokee

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Vehicle starts fine at times, and won't at all once in awhile

This happens when i shut the vehicle off to fuel, checked fuel pressure, fuel pressure went from 32 to o immediately causing vehicle to stall

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Most likely, the pressure check valve in the fuel pump has failed.
Pump is in the fuel tank and is not cheap. You may be able to find one in a salvage yard for a good price.

Posted on Dec 29, 2008

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however, being that the vehicle is 8 years old, I'd shoot for the pump first.

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My truck wont start when it is cold, i checked the fuel pressure and it reads 52 lbs. When the truck is warm it will start everytime. Oil pressure gauge is reading low, but the dipstick reads full.


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I would check the pressure right after shutting the truck off, then wait an hour and check it, and once again after another hour. If you lose fuel pressure then you either have a bad fuel pressure regulator or you have a loose fitting / cracked line or some problem that allows air in the fuel line causing the fuel to syphon back to the fuel tank.

The next time you try and start it cold, turn the key to the on position and listen for the fuel pump whine to stop, then turn the key off and repeat above step 2 or 3 more times. If it is losing pressure, then doing that will build your fuel pressure back up and it will start.

Check the pressures and report back your findings.

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