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Isuzu Trooper Fuel Pump Fuse Blows

The fuel pump st fuse ( not main fuel pump fuse )blows on my 91 Trooper when the ignition switch is turned to the start position. What might be a likely cause for this problem? Thanks. Bob


  • mstoutmstout Posts: 6
    On my '93 Trooper, 3.2, I removed fuel pump and jumped it directly to battery and works fine. Checked fuse and relay in engine compartment fuse box and all internal fuses, fine. I traced the fuel pump wiring up to the kick panel near pedals, jumped it there and works so from there forward is the problem. This happened as the starter began to act up, clicking on several start tries before finally turning over and trying to start. Had an appointment to change starter when the current stopped being sent to the fuel pump in a parking lot and had to be towed back to my home. I see no loose or frayed wires but battery is being drained really fast when left connected and a hissing sound sometimes comes from the back of the throttle body area when the battery is connected. The sound was present before the Trooper failed to start but when running, the sound becomes much louder. Any suggestions would be very much appreciated.
  • mstoutmstout Posts: 6
    You mention that there are two fuel pump fuses. Are both in the engine compartment fuse box?
  • Both fuses are together in the fuse box on LF area of engine compartment. Bob
  • tryumphtryumph Posts: 2
    a likely cause is shorted/corroded/frayed wiring under the truck just in front of the fuel tank, where the wires for the sending unit and the fuel pump are located. If you don't seen an obvious short, the easiest way to try to fix this is to wrap all exposed hot wires in the vicinity in electrical tape. You can't reach the individual wires for the fuel pump right where they go into the tank (without removing the tank, which is a PITA), but it IS possible to "thread" on some spiral-shaped plastic wire wraps, which will keep the wires from touching each other (one hopes). Or it could be a bad fuel pump, but I'd check the wiring first.
  • I have a 1998 Pontiac Sunfire that will blow the fuel when it is raining, snowing, etc. I have had the fuel pump checked and it is good. Dealer said that the fuel filter was clogged and replaced it. They said that it was the problem, but it has quit again(a rainy day). What could be causing this to happen, a frayed wire?
  • steverstever Viva Las CrucesPosts: 41,982
    Try the Pontiac Sunfire Electrical Issues discussion.

    Minivan fan. Feel free to message or email me -

  • Well why does a fuse blow? To many amps. Think of amps like gallons of water per minute. Sometimes Amps are represented as I for intensity on schematics. The must likely cause for a blown fuse is a short to ground. A short to ground means that current bypasses the intended path and flows directly to ground. There is a wire some where on you car that is exposed. I will assume that the fuse also feeds other circuits so there is probaley some other things on your car not working find out what those are and you can began to narrow your search. If you can read a schematic you are way ahead of the game.
  • blt7120blt7120 Posts: 1
    My 88 Trooper stopped cold while driving. The starter works, it has gas, but it will not turn over. Any suggestions?
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