Really there is only two reasons why fuel wont move to carb on these setups

1) there is some kinda of blockage..you have already determined that there was not.
2) the fuel system is not holding pressure to push fuel to the carb, A)check to see if tank holds pressure by disconnecting the tube to the carb and cap the outlet then blow into tank via exhaust tube. if it seems to move air thru then the tank is faulty. B)The check the fuel line and any filters inline for air passing thru using the same technique

Hope this helps-have fun

back to breaking in a new engine!!