After I fill up my black 66cc gas tank, gas bleeds out from under my closed gas cap until eventually it inevitably dribbles down the side of the tank over my newly applied decals. This needs to be stopped/vented somehow, maybe with a nice metal nipple inserted in the middle of the cap w/ some rubber tubing, but where would the end of the tube vent and would it work? I could drill a tiny hole in the cap but then what? Wouldn't it still continue dribbling gas over everything? I want to prevent gas vapor from collecting around the base of the gas cap when the tank is full. What is the best way to vent these caps?