Again, I’m doing things a little different from most other builders. I’m cutting the hole in the skins first and then mounting the filler caps to the tanks to match. I’m able to do this because I haven’t closed up the top of the tanks yet.
I figured where the hole in the skin for the filler cap should be. Be sure and miss the strap nearest the filler cap and leave enough room around the hole if you want to install a hole reinforcement ring.
I used the router again to cut the hole in the skin.