I had to replace the gas cap for the second time in 2 months on my Husqvarna bp. The solid gasket (except for the air hole) inside the cap will break except for a thin ring around the outer edge, therefore causing fuel to leak out from the cap when full or tilted. This has happened twice. I thought maybe I was putting the cap on too tight (maybe I am). The dealer told me this was happening because I had alcohol in my fuel. He said "non-premium " stations was the problem. The alcohol somehow is causing the gasket to do this. Huh? Anyway, Im gonna switch to a "premium"gas station and see if it happens again. Or maybe this guy is nuts,lol. We'll see.