In order to condense water out of the atmosphere a surface must be much colder than the air. The problem for the condensation in tank theory is; how do we end up with a fuel tank that is much colder than the air? One way would be to have a very cold day that suddenly warms up dramatically, but when does this ever happen? The weather can turn cold very fast, but does not suddenly get very warm.
In Maine in the winter where we can see temp swings inside boats of more than 40-50 degrees from night time lows in the single digits to the am sun hitting the shrink wrap, or dark colored Awlgriped top sides, and warming the boats interior to 40 degrees in a mater of an hour or two.... That said I am not a real believer that physical water appears in tanks when they are left half full etc... I leave mine empty...
-Maine Sail / CS-36T
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Last edited by Maine Sail; 09-16-2014 at 08:08 AM.