One of my ski partners 200 sits outside on a lift with a boat cover. Occasionally after a big rainstorm the boat won't run, it pops and sputters. Their normal course of action is to drain the fuel tank and FCC often finding water in the gas. I have noticed the fuel tank vent is one of those circular ones which is open all the way around. Could rainwater be making its way in through the fuel vent even though there is a cover on the boat? Being that the boat is outside and used year round how often should the FCC filter be changed?