Perhaps replace with the original cap for Winter storage. That way it doesn't soak all Winter. We used to have the same problem with the flat fender Jeep repro sending units. Finally figured out how to replace the float with an impervious plastic. They worked great after that.
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2005 CC GT2544
1980 IH CC 782
1957 Cub Lo-Boy
1993 Craftsman LT4000
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