the worse thing is to have the mice eat a hole in the supply hose and realize it after you fill it
damn mice
that ethenol they add has really screwed up lots of motors,carbs , boat fuel tanks etc.
I gave up on some of my yard thing and got electric for some of the lower powered things like hedge trimmer. It's frustrating even using stabil.
your snowblower might be alright, try starting it, if it runs either drain it or add more fresh gas 89 octane and some stabilizer.