Re: Fuel gauge diagnostics
Grounding the sense terminal on the gauge should cause it to read empty (like you're seeing), not full.
For additional testing purposes, connecting the gauge sense terminal to through a 15 Ohm resistor to ground should cause it to read half. Connecting it through a 30 Ohm resistor to ground should cause it to read full. And leaving the sense terminal disconnected should cause the gauge to peg beyond full.
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