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Good chance with it setting that long that you've got a lot of water from condensation in the gas tank. If that's the case, you could turn off the fuel and a) remove the fuel line from the carb end and drain down a quart or two, or until you are sure you're getting good gas. A large coffee can works, but I like something in glass so I can see if any water settles out of the drained fuel. While you have it apart, remove the brass elbow into the carb and make sure that it's clean, then replace it. b) before you hook the fuel line back to the carb, drop the bulb on the sediment bowl and clean it out. Have a look at the screen at the top of the bulb and clean it if necessary, especially if the fuel coming down the line earlier didn't seem to flow well. If it didn't flow well, you might as well unhook the fuel line at the top end and blow it out, too. c) Replace the bulb and hook the fuel line back up, and give it another try. One other thought relates to the carb. Might be that the float is stuck. Can't hurt to give a tap (not a wallop) to the side of the bowl on the carb. If all this fails, think about cleaning/rebuilding the carb. Check the condition of the float needle. If it's stuck, it could be causing the whole problem.
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