Poly versus aluminum gas tanks

[McGillicuddy]

Originally Posted by DonV

Has anyone heard if poly gas tanks would/could cause more condensation than aluminum? I know it's a goofy question, however I've got a friend who's boat I'm tired of fighting water in the gas and he has a poly tank. Drained it once and now four months later it's got water in the gas again. The bad part is I can't find any leaks. Thanks guys!

I doubt condensation is the problem. Typically aluminum or stainless would exhibit more water exchange from condensation. My guess is a leak at the fill cap...