Note: Refer to the warning note in Section 1 before proceeding.
Testing
1. To test the fuel pump on the engine, disconnect the outlet pipe which leads to the carburettor. Hold a wad of rag by the pump outlet while an assistant spins the engine on the starter. Keep your hands away from the electric cooling fan. Regular spurts of fuel should be ejected as the engine turns. Be careful not to spill fuel onto hot engine components.
2. The pump can also be tested after removing it. With the pump outlet pipe disconnected but the inlet pipe still connected, hold the wad of rag by the outlet Operate the pump lever by hand, moving it in and out; if the pump is in a satisfactory condition, the lever should move and return smoothly and a strong jet of fuel should be ejected.
Removal
3. Identify the pump inlet and outlet hoses and slacken both retaining clips (see illustration). Where crimped-type hose clips are fitted, cut the clips and discard them; use standard worm-drive hose clips when refitting. Place wads of rag beneath the hose unions to catch any spilled fuel, then disconnect both hoses from the pump; plug the hose ends to minimise fuel loss.
4.3. Arrows on fuel pump unions indicate the direction of fuel flow
4. Slacken and remove the bolts securing the pump to the rear of the cylinder head. Remove the pump aiong with its gasket. Discard the gasket; a new one must be used when refitting.
Refitting
5. Ensure the pump and cylinder head mating surfaces are clean and dry, then offer up the new gasket and refit the pump to the cylinder head. Tighten the pump retaining bolts to the specified torque.
6. Reconnect the inlet and outlet hoses to the relevant pump unions and securely tighten their retaining clips.