If you are having trouble getting the fuel bulb to pull fuel through, it’s possible that the fuel filter element has a pinhole in the casing caused by rust. You will have difficulty seeing it as the paint on the element will still cover the hole. It gives itself away when you look closely at the element while pumping the bulb. You will see the paint “blister” as the air pushes through the rust hole.
THESE FILTERS ARE FANTASTIC BUT THE TIN-PLATED CASING IS VERY THIN!
Get a new element.