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I have 1999 Pontiac grand am, my fuel pump fuse blows out whenever the ignition switch is turned. Do anyone have any suggestions on the problem?

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  • Cars & Trucks Master
  • 14,585 Answers

When you turn the key on, it sends power to a relay. On the back end of the relay would be the computer for the engine computer. Which controls the fuel pump. Basically telling the computer, I am requesting fuel. Since the fuse blows, the possibilities are a bad wire from the fuse to the relay. A bad relay. A bad wire from the relay to the computer. A bad computer. First pull relay in the panel,turn it on. If it doesn't blow the fuse, You have eliminated one wire. If it does, fix that wire. Then swap the relay with another in the panel, if it doesn't blow a fuse, replace the relay. If it does , then remove the two plugs from the computer(under the dash on the drivers side). If it still blows a fuse, fix the wire from the relay to the computer. If it doesn't blow the fuse. Replace the computer.

Posted on Nov 11, 2014

Testimonial: "Thx ur tips are helpful but I had the computer replace when it started blowing fuses the 1st time. It ran well for about month or 2, then it's started again."

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Posted on Jan 02, 2017

polarcycle
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SOURCE: 1999 pontiac grand prix gt 3.8L v6 cranks wont start

Is the security light on? If you have spark and fuel, it should run. Any codes? Could be bad crank sensor or cam sensor.

Posted on Mar 07, 2009

  • 10 Answers

SOURCE: fuel injecter fuse blow imeditaly when ignition turn on

sounds like a short in the wiring from the fuse and the fuel injector junction block. GM like most fuel injection systems control injector firing by the computer providing ground to each injector in pairs or individually. The fuel injector fuse provides power to the injectors using splices therefore enabling one wire to feed 6 injectors. A shorted wire at any of these wires will blow the fuse. On one rare incident I found a faulty computer caused the fuse to blow. A shorted injector will just cause a rough running problem due to the injector stuck either open or closed.

Posted on Aug 05, 2009

  • 491 Answers

SOURCE: fuel pump location 2001 pontiac grand am

The fuel pump is in the fuel tank.Sit in the car.....turn on the ignition switch to run.....listen very closely to the rear of the car...or have someone kneel down by the back wheel.....you should hear a "prime cycle"......the pump running for 2 or 3 seconds if the key was off for 15 seconds before trying this.If you hear silence you most likely need a fuel pump.Before pulling the tank down....check for power on the gray wire at the fuel tank connector just ahead of the rear axle under the car.Check for power with a test light that will last for 2 to 3 seconds as you turn on the key to run.Power means you really most likely need a pump.No power means you may need a fuse or a fuel pump relay.

Posted on Aug 11, 2009

thunderalley
  • 432 Answers

SOURCE: Fuel pump fuse keeps blowing on 99 S10

shorted wiring most likely at the tank

Posted on Oct 04, 2009

  • 1 Answer

SOURCE: I have a 97 pontiac

97 grand prix GT keeps blowing ignition fuse why?

Posted on Nov 15, 2010

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IF YOU TALKING ABOUT FUEL PUMP.CHECK FUEL PUMP FUSE AND RELAY IF FUEL PUMP NOT WORKING.FUEL PUMP FUSE RELAY BOX LOCATED UNDER THE HOOD .IF FUSE AND RELAY OKAY AND YOU DONT HEAR FUEL PUMP TURN ON WITH IGNITION SWITCH IN THE ON POSITION FOR 3 SECONDS, FUEL PUMP MORE LIKELY FAULTY.

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