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Pontiac Grand Prix Fuel Pump Fuse

Q. Hi Vincent, Any insight you could give would be appreciated, as none of my mechanics/dealers know what to do, and some of my colleagues on www.gp-owners.com have the same issue, and their dealers/mechanics can't figure it out either.

First the specs of the vehicle:

  • 2000 Pontiac Grand Prix GTP
  • 3.8 liter Supercharged
  • Automatic transmission
  • 42,000 miles
  • Fuel Injection
  • 4 wheel disk brakes, ABS
Pontiac Grand Prix Fuel Pump Fuse

The issue is repeated blowing of the fuel pump fuse. This occurs randomly and without warning, normally when medium to high throttle is applied. Generally the RPM's will fluctuate briefly before the fuse blows, which cuts off ALL power to the vehicle.

Especially dangerous on a highway! The first mechanic found a TSB related to the fuel pump resistor, and its default location in the wheel well can cause premature corrosion. He replaced it and relocated as per the TSB, but the problem still occurred.

Another owner suggested checking the vacuum seal on the fuel pressure regulator, which he said caused his problem. A weak seal under certain conditions would cause rapid fluctuations that would cause the fuel pump to "go crazy" and blow the fuse. I followed his advice by tightening the vacuum connection with a wire tie and making sure it was sealed.

Unfortunately, all these remedies didn't work. Several thousand miles later after trying to pass a car going up a hill, my fuse blew. Since then, nobody has been able to figure out what was going on. The dealer

tested the fuel pump load but couldn't find anything out of the ordinary.Unfortunately, the problem occurs so randomly nobody can reproduce it on a consistent basis. My temporary solution was to put a larger fuse in there, which has prevented me being stranded, but I know the problem still occurs. Any ideas?

Thanks,
Kevin

A. There has to be some wire "chaffing" going on here since it only does it while tromping on it. I would start by visually tracing the wires from the fuel pump forward. They may run inside rear of car and could be rubbing on a sharp piece of metal somewhere. Possibly under rear seat? A wiring diagram is needed and a lot of patience.

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