Thanks John and Matt. The shutoff valve is a good idea and easy to do. There is already a fitting in the middle of the fuel line that was leaking and had to be replaced so it would be easy to add a shutoff valve. That would be easier than adding a second small tank to feed Av gas in before shutting down. I would have to check if I have electric fuel pump. I assume it was installed when the Bee was built in 1999 so whatever Onan was using then is what it has. It has less than 300 hours on the generator which I would guess is mostly warming it up on a regular bases. The only controls I have inside the camper is a push to start and push to stop button. Even after a month it takes a 3 or 4 attempts at cranking 30 seconds or so each time for it to start so I would guess a manual fuel pump. If after a full year we find we just don't use it I may go ahead and put it in deep sleep and fog the engine. Although it would be tempting to just pull it out and take the spare off the back and put it back underneath.
The Onan is bigger than my Honda that I use for the house in emergencies so it is a good backup for that. I have the house wired for a generator and the plug that I use for the Honda is right beside where the Bee is parked in the carport so it would be handy. Honda supplies all the power we need and uses a lot less gas and is quieter, so the Onan would be strictly backup.