Went down to the boat 2006 Yamaha 50 hp 2 stroke today and when I started climbing in and out of it I noticed gas dripping onto the water. It hasn't ran for about 3 days and the temps and been in the 60's and 50's at night. I spent 30 minutes looking for a leak and could not find one anywhere. Started it up, ran it for a while, shut it off and no leaks. Is it possible that the gas is expanding and causing it to leak somewhere? Happened before and never could find a leak once I started it ( and even before I could not find a leak) Driving me crazy trying to figure out where the gas is coming from. I need help please!!