I have had this problem off and on.
It sat all winter. I ended up needing to jump it because the battery ran down trying to start it about 10 days ago. Today the battery ran down and the battery from my other truck started to run down so I quit trying. (I had teh motor out of commission so I couldn't jump it) It had started once but I killed it by giving gas.That usually indicates it is about to start running. I had poured gas in which usually works.
What is causing this? I put in the electric fuel pump which is supposed to solve the previously diagnosed evaporating gas in the carb bowl.. It is getting gas, I can see it and hear the sound change when I press the pedal while cranking. Choke is all teh way open and I take the cover off the aircleaner.