The flange, or pins, or whatever, on that fuel cap was not quite long enough to stay in the opening. Every time I opened the cap and let it hang, it would fall off. So, I took it off and placed it on the side door step. I was at a Walmart fuel stop and some old dude in a motor home as rushing me. When I left, I just forgot to put it back on. By the time I remembered it, I was about 5 miles down the road. No way I was going back. This pig was headed to the pen.