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Pontiac Repair/fuel pump not running


QUESTION: I have a 2005 Pontiac Montana sv6 3.5 liter replaced the whole sending unit cause of fuel pump failure still no power to pump. Hard wired wires underneath due to corrosion problems in connector still not coming on. Fuses and relays are good. What else would stop power to the pump. Security light doesn't flash when trying to start either

ANSWER: Hi jeff:
I think you answered your own question. corrosion problem. these vans when they get a water leak it pools in the harness behind the l/f seat at the floor pass thru. My guess is the harness inside the van is damaged from water and you have a high resistance in the power or ground ckts and that is why the pump doesn't run. pull up the carpet and look at the pass thru connector and harness. . good luck :-)

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QUESTION: That was the original problem I bypassed the connector and connected the wires directly under the carpet heat shrink over them and it ran fine then the pump died or so I thought so the sending unit was replaced now the pump won't come one. Wires going through the floor are good fuses are good connectors on the sending unit are good but still no pump working

does the fuel pump relay click on and off when you turn the key to run and when you crank the engine? if not you either have a bad relay or wiring issue to the relay or the engine computer is turning the fuel pump relay on. with out seeing it I can't tell you for sure what the issue is.

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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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