Question about 1988 Pontiac Bonneville

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My 88 bonneville keeps blowing the fuel pump fuse i can not fine a wire with a bad spot. how can i fine the bad wire to fix this problem

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It may not be a bad spot in the wire, it could be a bad pump thats tied up, or a bad relay, you need to run 12 volts directly to the pump to see if it runs, if it dosent than theres your problem, if it does than it could be the relay.

Posted on Oct 05, 2009

  • Gene Mattson
    Gene Mattson May 03, 2012

    i'm working on the same problem in my 94 Pontiac. After spending hours checking the wiring from the dash to the fuel pump I have found a short behind the glove box where there is a metal support bracket. the wire that powers the fuel pump was worn and shorting on the steel bracket.
    It would blow the fuse when I would accelerate hard. I changed the fuel pump for nothing because that was not even the issue.

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I have a 1994 bonneville 3.8-i replaced my fuel pump recently, i keep having my fuel injector fuse blow, i took the injectors off and tested and cleaned them,the car seems to run real good


You have a short in the wiring to the fuel pump.. Go back and check all the wiring you touched. you may have not routed the wires at the tank correctly and they are shorted (crushed).. SINCE IT HAPPENS SOMETIMES.. I WOULD put in a new fuse turn on the key start the engine and look at the wires near the fuel pump and move them to see if you can create the short and find it. you will know when you find it because the engine will stop running as the fues blows. Don't take anything else apart till you cure the first problem. The very worst thing it can be is a short inside the tank at the pump. Post and let us know what you find.

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