Hey, I used to work as a mechanic at a motorcycle dealership and we did quite a bit of work on various products, motorcycles, jet skis, generators, and atv's. Gas becomes a solid after time and will clog and then begin to consume a carburetor. Bikes will sit for long periods before they get used, weeks, months, even years. Sta-bil is popular especially with the boating crowd but am not sure how long this will prolong the life of the fuel. Gas tanks can however begin to rust if left empty for a long time. If the generator has a manual petcock I would suggest that you run the engine dry of gas by shutting off the petcock. Keep fuel in the tank but not in the carb. Keep some fresh gas handy. If you're like me the thing will sit for a long time till you need it, and you don't want to have to take the carb apart when you are sitting in the dark with the family. Fill the tank, run the engine dry, and if the gas in the tank sits for too long you drain it out, old gas has a specific nasty smell, you'll know it when you smell it.