Larry wrote:

Didja ever notice what all the light plane pilots do, religiously,
when they return to the airport, but before putting the plane in the
hangar? They visit the fuel dock and REFUEL....even if it only takes
3 gallons. Why??

I agree with you about boats sitting there in the water. However, during my
previous life as an aircraft maintenance officer I concluded, along with a
lot of other people, that filling aircraft fuel tanks wasn't necessary. We
draw fuel out of the sumps before every flight and I never saw water after
instituting a policy on not filling unless the taniks were below 3/4. There
are some aircraft fuel tanks, the ones with the rubber bladders that
insulate, and the "wet wings" where the situation may be different. Never
saw a problem though with the 172 with aluminum tanks inside aluminum wings.

I wouldn't refill my boat tanks after every trip because of this issue but
agree that it is vital for a long down time or winter layup.

--
Roger Long