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I have a 77 Avanti.  I filled the gas tank & it only read 1/2.  As I drove the gauge bounces between 1/2 & 1/8.  Recently I ran out of gas when the gauge read 1/8.  Is there a ground that is typically bad?  Are these gas gauges inherently faulty?  Any insight is appreciated.  Thx!!

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If you can get to the sending unit you can unplug the two wires and use resisters to test the gauge.

I believe 240 ohms is empty and 33 ohms is full, I could be wrong.

I use a 200,100,50 resisters to test the gauge positions. If the gauge works its the sending unit. If the gauge doesn't work its the gauge or wiring to the gauge.

Good luck,

Jim Wood

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