FUEL Gauge

I would dispute the claim that the tank grounds effectively through the frame. There is insulating packing between the tank and the trunk floor. The only contact would be through the strap which is only potentially grounded at each end. Many cars are undercoated in this location, and otherwise it is a likely area for rust. Plus there is a rubber gasket where the sender meets the tank — the contact there is just through the tightening ring, which touches at 4 points and is also generally rusty. In my experience, if you remove the ground strap the gauge stops working, period.

I think you might be right about the float, however.