Fuel carb trouble 150cc

[4getful2]

Double check your vacuum lines to the pump, make sure no kinks or loose connections. Check to make sure intake boot is tight on the jug and carb. is tight against the intake boot.
It is possible that all the fuel has leaked back into the tank, While cranking you may want to hold your fingers across the intake on the carb. and see if the carb. fills up and starts.
You may have a plugged up vent on the carb. as well .