How to fill up without getting it on the damn car?

I have a trunk mounted 15 Gallon fuel cell. No worries here I can just pop the trunk and open the cap and see how much gas I got. I don't even need a sending unit. I left the tube on the car for looks only. Nice thing is I can pull in to the pump from any direction. I get a lot of strange looks when I pull my car up to the pump and the cap is facing the wrong direction. Also having the fuel call in the trunk eliminates the chances of anyone siphoning out the gas.