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Originally Posted by espooner
It would seem that as the gauge goes full scale, and at least once read 3/4 full, that it is not the problem.
Eric Spooner
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Eric,
In my years of experience with ALL cars, irrespective of brand or model
the gauge itself is rarely the culprit.
In most cases the gauge is getting a varying ground signal from the sending unit. If it were I, I'd try to find the wire that is for the sender and not the power leg for the pump. I'd try grounding it solidly momentarily and have someone watch the gauge to see if it responds to a full ground.
It may only take a second or so for the gauge to go full scale, there is a damping circuit that prevents the gauge from responding to sloshing fuel. Without that, the gauge would swing wildly from full to half to whatever.
Hope that helps.