mine was doing the same thing i changed my bulb and line still did it then i changed my pick up valve. it still did not work. so i drained my tank and was going to get a new tank when i found a piece o silacone in my tank that came frome my fuel gage on top. and that was the proublem. we cleaned the tank let it dry and it has worked fine since. so maybe if nothing else works try checking your tank to see if it has anything in it. what happen is it would start idle then when i would take off it would die and i would have to wait and pump my bulb and try again. the silacone would cloug the line and kill the motor, then after it stoped it would fall back in the tank. it took me two mounths of doing diffrent things till i found out what it was. hope this will help

chuck