I would like to add that if you needle valve diapram is not soft and is stiff and hard then it will not open the needle valve properly and at the right time and this could also strarve it for fuel. pushing the primer bulb would still work if this was the case as it pulls fuel into the fuel bowl after the needle valve. It is also very important that the diapram and the gasket go to the right place or it will change how it activates the needle valve. You could also have a piece of junk in it somewhere clogging up the works. if the diapram and the fuel pump seen pretty supple than this is probably the case and just needs a good cleaning.