The design of the fuel priming and fuel priming pumps is shown in the figures
The fuel priming pump consists of an aluminum cylinder and a plastic piston with a rubber sealing ring and is designed to fill filters, fuel lines with fuel and remove air from the fuel system before starting the engine.
Disassembling the fuel priming pump
To disassemble the fuel pump, unscrew the bolts securing it to the high-pressure fuel pump, remove it from the pump and take out the pusher 92.
Do not disassemble the guide sleeve 93 and rod 94, which are a precision pair.
Secure the fuel pump by the housing in a vice with soft jaws with the handle-nut 81 facing up and unscrew the plug 98.
Remove the spring 96, piston 95, rod 94 and stop 97 from the housing 88.
To disassemble the fuel pump 91, unscrew the cover 82 and remove the piston 85 from the cylinder 83.
Then unscrew the cylinder 83 and remove the inlet valve 86 from the housing 88.
Assemble in the reverse order.