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Pontiac Forum: Losing all fuel pressure when off
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  #1  
Old April 8th, 2018, 04:26 PM
greenwater greenwater is offline
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Losing all fuel pressure when off

Our 01 grand am has hard starting and sometimes (seems like when it's very hot outside) it runs rough at idle.

I checked the fuel pressure and I get KOEO 50psi, with the engine running it's about 40 - 42psi. When I turn the car off and the key off, the pressure goes down to 15psi in about 20 seconds. I thought it should remain at the same pressure or drop a few psi.???

I have already replaced the FPR about a year ago because it was leaking gas out the top. The FPR seems fine still, and this did not change anything.

What should I look at or change next? Fuel pump?
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Old April 8th, 2018, 07:05 PM
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leaky fuel injector
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Old April 8th, 2018, 08:30 PM
greenwater greenwater is offline
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Is that more common than a bad fuel pump or other parts?
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Old April 9th, 2018, 09:29 AM
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You stated the fuel pump is giving you good readings and you state the FPR is also still good. The FPR holds the pressure constant, so unless you have a leak somewhere in the fuel rail after the FPR the next thing is the injectors. Pull the spark plugs and see if they show any signs of being wet with gasoline.
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Old April 15th, 2018, 04:23 PM
greenwater greenwater is offline
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Just an update.

I replaced all the fuel injectors and also the spark plug wires (I broke one, but that's unrelated. lol)

The car starts perfectly now!!!! Leaky fuel injectors were indeed my problem. Thanks so much!!!

I guess after 198,000 miles it's about time to replace the fuel injectors. They lived a good life and served this car well. Now they get to rest.
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Old April 15th, 2018, 04:27 PM
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excellant glad to hear that solved your problem
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