Condensation in fuel tanks

And evaporates when the temperature goes up. When was the last time you
went to the shed and mysteriously found a metal bucket had water i the
bottom?

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I thought that too. The petrol is lighter than the water thus the bottom
of the tank rusts out. I think it takes a while to separate out though.
The dogjizz web site is not very useful for clarification other than it's
for cleaning the insides of your engine of fuel related varnishes. No
mention of over winter storage.

 

It's perfectly possible to have conditions whereby it might be weeks
before any evaporation goes on. Besides; condensation will corrode a
steel surface just while it's there. The rust doesn't go away after.
If there's fuel in there any condensed water that runs down the sides of
the tank will end up underneath the fuel.