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The fuel gauge on my 66 cutlass goes past full every time I start her and goes to the correct (?) reading after a while.  I filled her up last week and the gas gauge has remained pegged above full.  Any ideas?

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Make sure the connection at the tank is good and clean.  If the fuel gauge see an open/ high resistance circuit it would read full all of the time.

 

Should be  GAUGE-------Fuel tank sending unit------GROUND.  Any break in the circuit between ground and gauge would register full.

                                         (Variable resistor)

 

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