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Sir, you are a gentleman and a scholar.
I took another look tonight and the nichrome wires are intact. When I take the resistance between the terminal lug, from wire to wire near the top or from lug to opposite wire at the top I get a low resistance with the float high and a large resistance, 80 or 90 Ohms, when the float is low. I don't get any reading from lug to center rivet or case. I do get the proper resistances measured from lug to the copper disc at the top but there is corrosion or fuel build up that tends to prevent electrical contact. When I put it back in the tube and connect the wire the tank still reads empty as I slide the float from end to end.
I suppose that copper disc isn't being grounded against the metal top.
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