He doesn't do that. I've seen the Wolfeman fill system and his pickup load of gas cans.
Found the filler neck on the Perko website. Cost is around 40 bucks for the filler neck. Still checking into prices and everything right now.
I looked closer at my gas tank filler cap, and the hull is shaped differently around the cap to allow it to mount flush. That might present a problem unless the filler can handle a curved surface.
Alot of newer boats are doing this already. I do not know why Moomba has not picked up on this. With the gas station I go too the hose is long enought to reach the other side of the truck so i can fil both truck and boat at same time. At other stations ring around the pump I go.
I have to shake my head every time I read a post about why the Moomba doesn't have this or that feature that someone saw on a Supra, MC, Malibu, etc. Remember, we bought the Honda equivalent in the car world so we shouldn't expect it to have all the bells and whistles that the Acura, Lexus, Mercedes have.
I don't view my boat as the Honda. I view my boat as the Chevy and the Supra as the GMC. That is how I feel about it.
At the station around here the hoses are long enough to reach across my boat.