Ethanol sucks:it's an alcohol, and alcohol absorbs moisture. You don't want moisture in your fuel, it wrecks shit. This is a carb from a Briggs and Stratton Vanguard Twin engine thats in a piece of equipment at work. It had old fuel in it, and sat around for awhile without any stabilzer in it. The fuel that sat in the carb bowl jelled up. Jellied fuel doesn't burn, it clogs up the jets in your carb. This is most likely why your lawnmower won't start, or is a whore to start in the spring if you didn't put ethanol specific fuel stabilizer in the tank back in the fall.
