Well looks like during my latest weekend at the race track I was leaking fuel out the gas cap. Never had more then 5/8th a tank have a non vented cap and made sure it was 100% clean/dry after filling up but when Id come in after a session would find fresh gas around the gas cap and leaking down the rear fender. If its any help this was at Miller Motorsports Park East track and I did on "occasion" go up on the curbing.

Any idea on solutions?

 

Sounds like you are pressurizing your gas tank. Have you checked the plumbing to the charcoal canister and the purge valve?