Hi there!..

On my 68 firebird, if the tank is full, the pointer only shows about 3/4 full, also it shows 'empty' way too early (proberbly 1/4 too soon)

Is this a matter of just removing the tank, and move a slider or something up or down ??

Or what should I do ??

Any help is very welcome..

-Claus

Check the "ground" on both the meter and the sending unit.

Jon.

Me too. Except mine says 3/8 when full and 8:00 when empty. Haven't seriously investigated the problem yet but I did replace the fuel tank sender and I know it's grounded correctly at the tank. So my problem must be at the gauge and your's is likely also the gauge.

I've seen pictures here of a resistor on the back of the gauge that gets fried. Maybe the resistor gets partially shorted and throws off the accuracy of the gauge? Let me know if you find a solution.

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I have a 2003 GMC Sierra. Its gas gauge reads as bad as the 40-year-old gauge in my 67 'Vert. When the gauge reads 3/4, that's really 2/3. At 1/2, it's really 1/3, and at 1/4 it's really 1/6. When the fuel warning light comes on, I have 21.4 miles to go.

I've never had a GM car that had an "accurate" gas gauge - and I have owned probably 20 GM cars. (All but 1 were Pontiacs.)