Question for people who have broken tanks. How do you notice it's broken, the odor of gas or does it leak bad enough to have liquid running onto the motor? When I sit on my seat now I can smell gas. Strong enough to smell it when I'm sitting still outside at the track. However I have been unable to find any liquid gas dripping down under the tank. I suspect the vent hose check valve may not be closing all of the way and letting some vapor out, but I wanted to find out how the leaks started in other cases. Thanks!