Look under the heater box to make sure the primer line is connected to the carb port.
The line could be broken and air escaping before getting to the port. Disconnect it at the carb body and prime with your finger over the hose. You’ll feel a slight push on your finger.
If the line is ok and the gas shutoff open then it should pump gas up to the throat. You could check to see if gas is getting to the bowl by unscrewing the bowl nut at the base of the carb and it should dribble out gas. You can catch the gas in a cup. Tighten the nut and gas should fill the bowl again. Loosen it and check that it refilled. If not then you could have a stuck needle valve.
Just one bowl and line full of gas evaporated should not be enough to clog things up. If you had quite a bit of gas in the tank even after draining most out and left the fuel shutoff on then that gas, the gas in the line and the carb bowl may have been enough to clog things. As the gas in the bowl evaporated and the float lowered it would let in what was left in the tank and keep repeating this until all the gas was evaporated.
The needle valve may be stuck, the welch area plugged or the bowl nut holes plugged. You could drop the bowl and spray up into the needle valve seat, spray into the welch plug hold and into the primer port and see if that frees things up.
If that does not clear things up then you’ll probably have to pull the carb for a cleaning.
