Wow! I believe you have done everything reasonable already. I wonder if there=20 is some kind of condition around the switch point involving a buzz or=20 flutter due to the float being in the transition area for awhile? That might stall the reed at a very close space for long enough to build=20 a tiny arc weld? On 10/16/2013 6:42 PM, Carl Denk wrote: > The issue at this point is finding a float switch configuration to fit > the existing tank, hole, etc. I have been thinking of replacing the > plastic fuel tank with a fabricated steel tank. If I ever get to that > project, I can study the possibility of hall effect switches. The > replacement switches were delivered today. Here's a link to the switches: > http://ecatalog.gemssensors.com/ecatalog/singlepoint-level/en/165570 --=20 John Ferrell W8CCW "Shut her down Scotty, she's sucking mud again!" --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .