In my zeal to clean out the fuel tank I managed to blow out the little silicone valve disk from the fuel cap. I removed the rubber gasket and soaked the gas cap in ZEP to clean up some surface rust and grunge. It was very dirty. After a thorough rinse it looks like new. I used compressed air to blow out the excess water and dry it out and a little cream colored silicone disk on a stalk popped out. It came out from the little hole in the center of the cap if you look at it from the bottom. Does anybody know which way this thing goes back in? I?m thinking it goes in ?head? first with the little tail following. The service manual I have does not go into that much detail. Anybody else ever have this happen?