1987 harris 30ft pontoon I/O 2.3l ford omc, I have a flip up sundeck at the stern section of my boat that acts as the top of the engine compartment. I am curious on the "legal" side of a fuel fill location. can I put the fuel fill under the sundeck "hood/hatch" or does it have to be on the exterior or outside of the rail? I am not sure on if there is a coast guard safety issue here. I would like to mount them more vertical then horizontal because its such a pita to try and fill on that horizontal angle! thanks in advance