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Pontiac Repair/Fuel Pump stuck on


QUESTION: I have a 2005 Pontiac Grand Prix 3.7L. The fuel pump is stuck on without the key in the ignition. I checked the relay and it is good. I really have no idea where to troubleshoot from here, any help or ideas would be appreciated.

ANSWER: Hi andy:

just so I under stand first off you have a 3.8 liter engine is this the base engine or the super charged engine? the pump runs all the time with the key off so it will drain the battery because the pump will not shut off? you pulled the fuel pump relay and the pump continues to run? ? Lets start there.

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QUESTION: 3.8L base engine.
The fuel pump runs constantly, even without the key in the ignition causing the battery to drain. When I remove the fuel pump relay, the fuel pump shuts off. I bought a new relay and also tried switching relays with the horn.
Thank you for the quick response! 38

Okay. if the pump turns off when the pump relay is removed then you either have a shorted wire betwwen the under hood fuse box and the ecm to ground or a bad engine control module. A rubbed though wire harenss could be the culprit. take a loog along the wire harenss from the engine control module which is in the air cleaner box and follow that harness across the engine to the fues box and then also down along the a/c lines and up by the radiator I would bet money your going to fic the harness is rubbed though against something metal and that is keeping the relay grouned and the pump running. I highly doubt you have a bad engine control module. good luck :)

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Todd Puccio


General auto repair,electrical issues,driveability issues,anti-lock brakes,SIR systems,HVAC,engine performance,Gm specific. I have worked at my current dealership since the 1990 model year anything much older than that I have limited exposure to. I do not have very much transmission experience so those question you may want to ask of another expert. When you send me a question let me know the exact make/model/engine and year for the car or suv you have it makes it easier to answer the questions that way. If your happy with the answer I gave you please feel free to Donate. This is a free service to you and I am not compensated at all by this web site. I have 22 years of experience to share with you and my knowledge wasn't free to me. I had to pay for my education.


Experience in the area: I have been a technician in GM dealerships for over 22 years and I am a ASE master technician. I work at a Buick and GMC truck store Previously I worked at a Pontiac GMC store for 18 years. I Served a a lead technician when dealership was on a team system. I just recently moved to a Buick,Hummer,Saab Store when my franchise was purchased by this dealership. Organizations: ASE master technician


Education/Credentials:High school diploma,2 year vocational school degree 2 year college degree. Associates degree in applied sciences (auto technology)Awards and Honors: GMC master technician

Awards and Honors
Master GMC truck technician Master ASE technician in 9 categories

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