Question about 1991 Chevrolet Cavalier

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1991 chevy cavalier- stopped running going down road. Replaced fuel pump and fuel pump relay-ran for two weeks and the when making a stop,cut off again and won't start and is blowing the fuel pump fuse when you turn key, even with fuel pump unhooked

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Sounds Like you have a defected pump. Or the wires to it may have gotten pinched. The fuse is showing you an over load. DUE TO FIRE !!!
( Don't use a over size fuse it can start a fire! )
You are going to need to start by dropping the tank. Check all wires around the tank. You are looking for bare wires. Then remove fuel pump check all wires going in to tank & wires in the tank. Now with fuel pump out check the wires on the fuel pump.
Now you that you have checked the wire and all are were good take the fuel pump back and tell them what is going on. They should test it.

Posted on May 31, 2010

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Sounds like a short between the fuse panel and the fuel pump relay. This can be from the fuel pump relay itself through an exposed bit of wire, or even a defective relay which seems to happen more than most times. Check the wiring to the relay and wrap or tape anything where bare wire may be exposed. Disconnect relay and try a new fuse. IF the fuse doesn't blow, then the problem source is the relay itself that is defective.

Hope this helps!
Chip

Posted on May 31, 2010

  • dpoplin May 31, 2010

    Blows fuses with the fuel pump unhooked and also with the relay unhooked. Do any other circuits run with the fuel pump. Ex: radio, headlights,etc. My son's toyota truck fuel pump will not work if wiper fuse blows.

  • stmc97
    stmc97 May 31, 2010

    Most vehicles require a separate fuse for the fuel system as most cars after the late 80's have fuel cutoff switch during which is shut off during an impact from an accident, etc. That way fuel is not continually pumping. I would expect that somewhere between fuse panel and the end of the wire attaching to the relay is gotten worn and is shorting against the frame of the car. Trace and locate, although time consuming, it will present itself. Not really any other places it could be.

    Chip

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