Mine did yhe same thing.. I wrapped my fuel line with the heat shield and covered the side of the gas tank with heat shielding as well... this helped alot. I'm not sure if that was the fix or the fact that I moved my belt exhaust to blow out behind me seat but I have not had gas come out of the vent again since.Yea I wrapped the fuel line from tank to motor. I'm in the process of making a barrier to help block the radiant heat from the motor. I got some more of the shiny reflecting tape to put on it. The vapor smell got so bad my wife didn't want to ride anymore. So I put on a longer vent hose and ran it up to the top of the rear window. The pressure got so high in the tank it pushed raw gas up and out. That's at least three feet above the tank.