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Ford F-150 Fuel Gauge Pegged

Q. Hi Vincent, my son has a 1987 Ford F-150. It has been stalling out a lot, kind of flooding. He changed the fuel filter, that didn't help. His gages were not working, so I checked his fuses, the fuse for the instruments wasn't in, so I put it in and all the gages then worked. The fuel gage showed it was on empty so I poured about a gallon of gas in the tank.

Ford F-150 Fuel Gauge Pegged

The truck then started so I went to the gas station and put about 8 gallons of gas in. The fuel gage pegged past full when I started it. I had someone tell me the sending unit in the tank was bad. So I order a new sending unit, which also is a new fuel pump. We placed that tonight and the truck is running good but the gas gage is still pegged past full.

I also noticed that the vent hose was off of the top of the tank when we dropped the tank. The hose was to small to fit back on the tank so I left it off. Do you think that could have anything to do with the gage and stalling problem. Let me know what you think.

  • 1987 Ford F-150
  • 4.9 liter
  • Manual transmission
  • 124,000 miles

Thanks,
Andy

A. That vent hose may contribute to a stalling problem if it is a vacuum leak, but other than that, probably not.

When a fuel gauge is pegged on full, that usually indicates a bad fuel gauge or a short to ground somewhere in the wiring. What you'll need to do is check the wiring from the gauge to the sending unit.

If the wiring is good, then the fuel gauge will need to be replaced.

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