If you take the generator off the valve and open the valve and it gets fuel then your gen is probably clogged. Very carefully pull the cleaning rod out of the gen there is a spring and a cardboard tube in the gen. Pull them out and clean the spring. Carefully put it back together. Be super careful not to bend the wire on the rod. Once back together soak it with carb cleaner. Put gen back on the valve and recheck to see if you get fuel through the gen. Edit: the generator is the brass rod sticking up off the valve the air supply tube is the steel ,tube that’s behind it on the piece you took off. The whole part is the burner assembly.