gerard, there isn,t a one-way valve in the hand primer that you squeeze to bleed the system.The one-way valve is inside the "push on" fitting that connects to the filter housing. The slightest bit of debris (sucked up from the tank) that gets stuck in this non-return valve will cause it to malfunction. ie. when you attempt to prime/bleed the fuel system by squeezing the rubber bulb, fuel will just flow to and fro inside the fuel pipe, not just travel in one direction as intended by the one way valve. If you change the fuel filter make sure that you fill the filter bowl completely with fuel before fitting it back to its mounting and reconnecting the fuel pipes. Hope these tips have helped you.
Micko (Aus.)
March 2015