That's a problem. You're going to have to trouble shoot that. Could be a few different things.I took the carb off with fuel in the line and its bone dry inside the carb.
First thing to check is the petcock and the tank vent. Remove the fuel line from the carb, and open the petcock. See if you have fuel flow. If not, remove the gas cap, and try again. If you have no fuel flow then find out why. A common problem is gas caps don't have vent holes.