A few years back, we had to park a few of our Skymaster on the ramp and never had a problem with water in the tanks except for our E model. The left aux would collect a significant amount of water after a rain. I changed caps, cleaned the scupper drains, did everything I could think of to try to figure out how the water was getting in the tank.
So one day I was fueling it and when the left aux was full to almost running over I noticed fuel coming out between the filler cap adapter and the tank. No sealer was ever there. So if you have a tank making water, you might want to check that
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