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					Originally Posted by  ScubaSteve
					 
				 
				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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 Off topic but you do realize that gas and diesel are all refined from the same oil don't you?  Biocides are used in both as far as I know.