Yes done that, the primer pump gets the fuel up to the carb and it drips from the air filter as it should. If the non return valve is crook it won't pump at all. Had it apart a few times as well. When you are ready with yours I am happy to come over to help, the pump gives a bit of trouble until it finds its stride.
You have to bleed them a bit as well at the connections to get the fuel flowing.
