are you the least bit Handy ?
i would get 3-5gal can of gas,
a can of Sea-Foam
mix the sea foam in the gas
disconnect the fuel hose inlet to the fuel pump
connect a piece of fuel hose and put in the gas can
get generator started run until gas is gone, 4 hrs ? or more,
may have to get some fuel into carb let soak overnight
then run it it the next day, keep it running until it smooths out and runs right
install fuel cut off
in RVs being stored sta-bil in the fuel is a good idea
for preparation, also buy a spray can sea foam,
on the day before remove fuel hose from carb and insert spray nozzle and fill carb with sea foam spray
let it set overnight, before running the sea-foam gas thru the carb and engine,
NOTE expect a lot of smoke, that is normal when using sea foam