Thanks but I found a problem now I have removed the sender. The float is fine - empty. The body of the sender in the tank is coated in aluminium/aluminum oxide but otherwise everything seems clean. The problem seems to be the bar holding the coil of wire had been dislodged to one side and the sliding pointer was no longer in contact. I nudged it back and the pointer makes contact again. It reads from 0 Ohms empty to ~60 Ohms full. Is that right for our cars?
The bar does not seem a tight fit and I am concerned it may get dislodged again so I plan to pack something insulating between the side of it opposite the moving pointer and the casing. Hopefully that will hold it in the correct place. If not, it's time for a new one.
David
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