620 fuel overflow clogged??

I live in San Francisco so i have to ride in the rain. when i stop for gas during or after a rain, i flip up the gas cap and theres always standing water in the little moat around the fuel inlet. worse than that, because my bike is on the kick stand, the water flows INTO my fuel tank. i have to be standing there at the ready with paper towels to mop it up.

1. shouldnt my gas cap have a better seal around the overflow area?
2. shouldnt that water drain naturally whenever it builds up?
3. do i have a pinched drain hose or what?
4. if so where is it located to i can troubleshoot it?


thanks