1991 Pontiac Firebird fuel guage

Tiny
WILDMANHOGG7
  • MEMBER
  • 1991 PONTIAC FIREBIRD
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 10,432 MILES
My sons 1991 pontiac firbird's fuel guage shows full even if the ignition switch is turned off. However, He does have a full tank of gas. Is the guage suppose to show this even with the igntion turned off?
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Thursday, March 25th, 2010 AT 10:59 PM

3 Replies

Tiny
BLUELIGHTNIN6
  • EXPERT
Pretty certain it should read empty in the OFF position. Easy way to test the sending unit is to unplug it, its near the fuel tank. Once unplugged, turn ignition on. If the gauge stays on full then the fuel gauge sending unit needs replaced. If the gauge goes to EMPTY then check the circuitry on the back of the instrument cluster as well as the pink wire from the sending unit. If circuitry and wire is OK then this also points out a faulty fuel gauge sending unit.
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Thursday, March 25th, 2010 AT 11:11 PM
Tiny
WILDMANHOGG7
  • MEMBER
When the gauge was stuck on half full I replaced the sending unit and the gauge went over to the fulll mark. But it still remains on full even with the ignition off.
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Thursday, March 25th, 2010 AT 11:36 PM
Tiny
BLUELIGHTNIN6
  • EXPERT
Have you drove it anywhere to use some gas? If it reads fine with ign. On then wouldn't worry about it. If its stuck on full then there is still an issue and if the sending unit was already replaced it must be something with the instrument cluster itself or wiring.
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Friday, March 26th, 2010 AT 1:08 PM

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