78 Bird gas gauge bouncing - Electrical - Firebird Nation

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78 Bird gas gauge bouncing

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2 replies to this topic

#1 EdKnecht


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  • First Name:Ed
  • City:Peotone
  • State or Province:IL
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  • Year: 1978
  • Make: Firebird
  • Model: Base
  • Engine: 350
  • Transmission: Th400

Posted 3 weeks ago

Put in a new gas tank, the old one had a new sending unit installed by previous owner. I installed new wiring from the sending unit to the harness in the trunk as the previous owner used a crap ton of shitty wire.  All hooked up, added gas, gauge works....only problem is driving down the road the gauge floats all over...stop and it’s steady.....hmmmm.   Any help would be appreciated 

#2 Formula71


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  • Year: 1971
  • Make: Pontiac
  • Model: Formula Firebird
  • Engine: 400
  • Transmission: M22 "Rock Crusher" 4 Spd

Posted 3 weeks ago

Common problem with cars of that era. I'm not sure if anyone has found the perfect solution.

RIP Jay - So glad to have known you

#3 Papa Tango

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  • Year: 1996
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  • Model: Trans Am
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  • Transmission: Automatic 4LE

Posted 3 weeks ago

Ed, You said you installed a new tank. Also, the previous owner installed a new sending unit. It sounds like you used that sending unit. Did you check the float assy. and sending unit with a meter before re-installing it? The fuel gauge moving around, while driving, sounds like a loose/ bad connection (ie: loose ground, corroded terminal). Could the float assy. be loose inside the tank? You need to get the wiring diagram and check the connections with a meter (ie: move the harness around). In the meantime, drive on the top half of the gas tank! (advice from an old timer)Good Luck, Pete

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