How do you remove the gas filler tube ?

Bought a fuel cell and mounted it in the trunk many years ago. Still have the filler tube for looks but that's it. Now I can pull into the pump from any direction and also do not have to worry about any fuel spilling on the paint. And I do not need a sending unit as I can monitor the level in the cell by just removing the cap and peeking in the hole. No need for a locking gas cap either.

And this helps, how?