[Bob Bidonde]

Wow! I never thought about water getting into the gas tank from rain / the garden hose. Now that you mention it, I can understand water intrusion via the vent in the cap. I have had condensation develop in the gas tank during the winter months, so I keep the gas tank full in the winter.

I think carrying a plastic bag or one square-foot of plastic sheet that can be taped over the gas cap will keep the water out.
Thanks for the heads-up!