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Roger Long

wrote:

Oh, but they DO. Any variation in temperature of the air surrounding
the tank will cause a pumping action. Temp goes up, the air in the
tank expands and finds a way out to create equilibrium. Temp goes
down, the tank inhales air containing moisture.

So? The moisture just goes right out again with the air. In the case of
the empty tank for the winter Rich was discussing, there is no thermal mass
of fuel to create the temperature differentials that would create
significant condensation. Even in the case of tanks partially full of fuel
condensation on a tank top is unlikely to be a significant issue (see my
reply to Larrry).

--
Roger Long