I got a related story to the use of gas cans. A customer of mine was telling me about how at the gas station when trying to fill his tank he would have to go real slow or it would trigger and shut off. He was frustrated that it would take forever to fill his tank up. He hired me to install a used replacement filler neck. When taking it apart I found the problem. A long white piece of plastic was stuck in the filler neck. It was a internal check valve type of device that obviously slipped out of a gas can when someone poured a gas can into the truck. Beware of these newer cans with these hidden parts inside the spouts that can inadvertently end up in your tank!