Something does not look right with your tank. I am thinking that the stopper needs to go in a bit further. The lip on the tank is designed so that you cannot shove the tank forward and pinch your fuel lines. In your case, it is not going to allow you to put the stopper and fuel lines in the hole. There are still tanks available that will allow you to fit the stopper into the hole, or you can use the one that you have and cover the hole. Good Luck, Dave