Exactly the same thing happened to me. What I did was disconnect the fuel line at the carb and draw the fuel all the way to the carb, then squirted some fuel into the carb with throttle fully open, then close the throttle half way before flipping. It should start.

Another thing I can think of is pressurize the tank by about one atmosphere after you draw the fuel to the carb, and with the spark plug removed (a lot easier to flip that way), flip the prop till you smell the gas. Then you install the sparkplug and ignition.