old fuel can still varnish even if it is wet, in as little as 2 months. you are useing a fuel stabalizer in it, I had to look it up to see what you ment, so you should be fine over the winter and just start it up and burn it through in the spring. a stabalizer usaly is good for up to 6 months. I used to do that, then I switched to running the carb dry as my genny hardly gets used and even with stabalizer I was getting gunking as somtimes it wouldnt even run during a season. now I am back to wet but I am using synthetic fuel for the last tank. doesnt need a stabalizer, doesnt break down at all and it is always ready to go.