401 fuel gauge
Had the same/similar problem.
The sender consists of a wire wound potentiometer and a wiper arm as part of the float arm. The earth return relies on electrical contact that is made where the wiper arm pivots in the case of the sender assy. I determined that to take it all apart to refresh the pivot point would be a hiding to nowhere so shaped a length of light gauge spring wire to wrap around the pivot point with one end screwed to the case and the other end coiled a few times round the float arm on the tank side. The spring wire is not strong enough to have any effect on the float position.
John
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