Gasoline doesn't really "go bad". Like, it's been sitting in the ground for a few thousand years... it is long since "gone bad". Diesel on the other hand can actually get bacterial blooms in the tank and fuel lines if it sits for a long time. This can cause all sorts of hell. Is it gas or diesel generator?
The bigger worry is letting the engine sit too long. Just start it up for a few minutes every few months to give it a bit of a refresher and to make sure it does work for when power outage does roll around.
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