I already have a 3 pin plug that fits perfectly in the internal hole but my thinking is it would be quite stupid for me to use this as the power inlet. I can't imagine attempting to plug in during pooring rain and not getting shocked or tripping the RCD in the switchboard.


There is a "moat" and drain hose internally around the plug so it wouldn't fill up with water but I can't see any way of using it.
I can post more pictures (of the internals of the fuel filler) if anyone can see any hope.
Since we are about to do a respray, the fuel filler is destined to be be removed permanently and we will mount a standard 15 Amp caravan inlet at the rear of the car (most likely colour coded to the car).
I just thought I'd post this in case anyone has any better ideas/lateral thoughts.