I had to pull the fuel pump/sending unit on my 425 because the o-ring that seals it to the fuel tank was missing. Apparenty the previous owner replaced the fuel pump and forgot to include it. Side note: that wasnt the problem, it was a bad ground.
Anyway, there was so flaky rust spots on the sending unit. I tried to clean them off, but no dice. I bought a new complete unit, and ill keep this as a spare, but what causes this? Without the ring, do you suppose moisture entered between heating & cooling of the tractor?
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