Cardo111 has pointed out that there have been issues with some of Ariens gas caps not wanting to go back on without a fight. He, himself, has experienced it firsthand with his machine. On the other hand, I have had no issue with mine. In an effort to figure out why it is occurring, here are some pics of my gas tank/cap so they can possibly be used as a comparison to others who are experiencing problems with theirs. I tried to get as close as I could from a variety of angles. I hope this helps.