Quote Originally Posted by 12vdc View Post
In my experience with gasoline gensets, its better to leave the fuel than drain the reservoir. Those jets gets clogged more easily when air interacts the metal turning into surface corrosion. If fuel is still in the carb, bottom parts are insulated from air thus there's less tendency to corrode. Just like any engines, warm it up every month or week (if possible) to lubricate/insulate the internal parts. If neglected for long period of time, drain the stale fuel from the reservoir, replace gear oil, clean air filter before trying to start. Check readiness of genset if power outage is anticipated like Typhoons/ rotational brownouts. I also stock spare spark plugs and fuel hose because they are the consumable parts that usually break.
I have the opposite experience. I use to leave fuel in my small genset. Carb got blocked in some tiny holes. RPM was fluctuating wildly.

Now, when it is time to turn off the genset, I just set the petcock valve to OFF and let the engine die of fuel starvation.