My generator won't start. I used sta-bil fuel treatment and then stored it for 3 years. I drained the fuel out of the tank and carb bowl (it was dark yellow) and added fresh fuel. When I try to start it, nothing happens, I pull and pull until fuel comes out into the air cleaner. (flooded) What do I need to do to get it running again? It has proper oil level. Also, where can I find part number for new spark plug for this 10 hp Briggs and Stratton OHV engine?