This chemical engineer doesn't have too much experience with KOH. What is the fuel tank/strainer/sender made of exactly? Anything aluminum is going to get corroded readily. Stainless and carbon steel should be fine. Not sure if the sender is aluminum or steel. I will look up reactivity rates when I get to work.

A mild vinegar solution followed by water flushes could be used to remove the KOH residue from aluminum parts. The trick is figuring out if the neutralizing agent will cause more problems than the KOH.

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Greg Schwall

1983 300SD - 465,000 miles