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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Posted on Jan 02, 2017


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Have 97 yukon on hot days going uphill then stoping for awhile it wont start but let set for awhile it will start is this vapor lock and what can i do

Most fuel injected vehicles no longer experience vapor lock, since fuel circulates continuously thru the fuel rail and back to the tank. More likely, you have an electrical part which gets hot once you shut the truck off. You need to test for spark to the plugs, and also correct fuel pressure when it fails to start and see which is lacking.

Jun 19, 2015 | 1997 GMC Yukon

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Have intermiate starting problem. Sometimes will start up and sometime cranks several attempts then will try and start then once finally starts after many attempts will chug for a few seconds then runs...

Sounds like you may have a fuel injector bleeding off when you shut it off, causing a flooding problem. If you can test the fuel pressure to see if it loses pressure after the engine is turned off that would help diagnose the problem. Depending on what vehicle it is, it could also be a bad fuel pressure regulator.

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1990 Chevy Cavalier Z24 Starting Problem

I'd use a gage and check proper fuel pressure, 3.1L vinT, 40.5--47 psi.
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Apr 30, 2017 | Chevrolet Cars & Trucks

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2002 alero ran.shut off won't restart.Replaced fuel filter,now it gets gas,but still won't start.

For some reason aleros have this problem every once in awhile. It might be the security on the alero. What you would have to do is turn the key all the way to accel i believe right before you start it and let it sit for about 13 minutes. affter this the security will recognise itself and start your car

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Low fuel pressure 99 cherokee classic

either fuel pump but change fuel filter first and see if it helps

May 13, 2012 | Cars & Trucks

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My car starts every once in awhile. when it starts it runs for a few minutes than shuts off. what can this be caused from? i have changed the battery, the fuses, and the fuel filter.

Fuel pump. try key on 2 or 3 times and see if it starts right up. this builds up pressure to the injectors. You can also do a fuel pressure check to see. Also check the codes, even if the light is not on.

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Trouble Starting

sound like either leaking injector or failing fuel pump/check valve

cannot diagnose with a scan tool because you need to run a power balance test

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

to confirm leak down you will need a fuel pressure tester installed before you shut the vehicle down, then wait a few hours and check fuel pressure before turning the key on. fuel pressure should be withing a few psi of what it was when you parked the vehicle

Apr 03, 2010 | 2002 Ford Explorer Sport Trac

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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.

When are you taking the fuel pressure reading? After it has sat for awhile or right after you shut the truck off when you get it running? Have you tested the pressure right before you try to start it cold?

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.

Dec 02, 2009 | 1999 Chevrolet K2500

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Car runs fine till it is turned off

two things come to mind....
1- a electrical component may be heat sensitive and not function after turn off heat soak
2- your fuel pump check valve isn't holding fuel pressure in the fuel loop 
Next time check for spark...if thers's spark it's a fuel problem

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1997 gmc sierra shuts off while driving

Had same problem with a Yukon. Turned out to be a bad fuel pump (Won't show codes.) When cold ran fine, heated up, no pressure. Would start after sitting for about 1/2 hour. When engine dies on you check for fuel pressure under the hood.

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