I think the bigger issue with fuel sitting too long is that it will create a varnish like coating inside your carburetor & carb float bowl. Gum up the needle valves & jets, almost impossible to remove once it gets in there. Most newer vehicles, four & two wheelers have injection systems vice carbs these days, but I reckon your generator will still have a carb unless it's a diesel. In any case, fuel stabilizer and run it once a month I'd say, you should be good. And run it for 5 to 10 minutes right after you add the fuel stabilizer to get the stuff into the entire fuel system.
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