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I have a 1979 Z28 with 25K original miles. The fuel gauge is way past the full line and is empty around the 1/2 way mark. Does this sound like the floater or guage or something else. How can I test this? Thanks
 

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Welcome to the Club !! If you were to take the 'tan' wire in the body harness and ground it, the gauge should show "EMPTY."

GM fuel gauge works on the 0 ohms = empty, 90 ohms = full. Or standard stock resistor size is 100 ohms, for full reading.

It reads like the gauge pointer may be "out-of-time" on its own shaft within the gauge.
 
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