Question about 1996 Buick LeSabre

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Original fuel pump not sending fuel, newly installed replacement pump also not functioning. No sound (humm) from pump(s) when key is turned to accsy position. Also, power windows stopped funtioning at same time (not sure if wiring is common somewhere back in the line)

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The pump doesn't run in accessory position, and in run it runs for 1 second then it is shut off unless the engine starts.

Posted on May 06, 2010

  • yadayada
    yadayada May 06, 2010

    TURN THE KEY TO RUN AND HAVE SOMEONE LISTEN AT THE OPEN GAS CAP TO SEE IF THE HUM OF THE PUMP CAN BE HEARD, THIS IS EASIER IN THE GARAGE, REMEMBER THE PUMP WILL ONLY RUN FOR ONE SECOND, SO TRY THIS 4 OR 5 TIMES TO BE SURE, IF U ARE UNSURE OF THE FUSE FOR PUMP BEING GOOD I BELIEVE IT IS LOCATED UNDER THE REAR SEAT AS OUTLINED IN THE OWNERS MANUAL, IF U NEED A PDF OF THE OWNERS MANUAL HERE IS A LINK TO GET ONE FROM GM SITE, U WILL NEED A YAHOO ID TO ACCESS YOUR OWNERS MANUAL.

    http://www.gm.com/gmownercenter/gm/

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the fuel pump fuse is in the fuse panel,using a test light with key on check all the fuses.you say you have checked the wiring so i am assuming you have checked powers and grounds at the pump on the pump wires and not the fuel gauge wires.its possible that you have a bad pump,and yes you can get a bad new pump.was the fuel pump the original problem or did you just start replacing parts without testing.

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hope this is helpful if so vote for me or leave a comment good luck

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You checked for, and have spark, next check for fuel to plugs. After several attempts to start, pull a plug and look for evidence of fuel (should be damp after several starting attempts) Do you hear a humming sound when the key is turned on to start? That would be coming from the gas tank, and is evidence that the fuel pump is functioning. If no gas, no humm, check for power to fuel pump. If there is power to the fuel pump and connections are ok, the pump is bad and needs to be replaced. If humm present, try changing the fuel filter, there's a chance it's plugged up. Let me know how it goes.

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1999 honda civic 1.6L very intermittent no start/stall no codes happened twice in 2 months when cold stalls very intermit when warm in gear


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Need to listen for fuel pump humm for proper operation. Shoud humm for about 3 seconds with key turned in the on position. Humm will sound from gas tank where the pump is located. If it does not humm. possible Faulty Fuel pump relay or pump. It will need ferther diagnosis.

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Do you have the car at your house? Check fuses and relays. Some are tied in with the ignition system. For the oil level check it with puting an actual pressure guage on it. The sending unit for your oil psi might be worn out and not sending the correct reading. Check and see if you are getting fuel and another way to check the fuel pump is take the gas cap off, have someone turn the key on like they were going to start the car and you should be able to hear a humm coming from the gas tank this means the pump is okay. If you have the humm but no fuel comming up to intake then check the fuel filter, if it hasn't been changed in awhile it might be clogged.
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Hi, you should run a fuel presure test ,fuel pumps can get bad when they run dry afther runing out off gas ,Good Luck..

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