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: These pumps are typically integrated into a single assembly with the RSV-type governor and the fuel feed pump for streamlined operation.
Supply low-pressure fuel to the pump using the hand primer. Fuel will flow freely out of the tube.
Never force the rack. Usually, one or more plungers are stuck "up." Use a blunt tool to gently free them until they follow the cam. bosch pes4a manual
The PES4A is sensitive to air locks. Use the hand primer pump on the fuel lift pump to bleed air from the fuel filters and the main pump gallery plug.
Manually rotate the engine crankshaft in the normal direction of rotation. : These pumps are typically integrated into a
: Change the pump oil every 200 to 250 operating hours, or concurrently with engine oil changes. Procedure : Locate the drain plug at the bottom of the pump housing. Drain the old, fuel-diluted oil. Reinstall the plug.
: The "PES4A" designation indicates a 4-cylinder in-line pump with an integral camshaft ( E ) and flange mounting ( S ). Never force the rack
Service manuals for the PES (and the similar PE) series cover critical maintenance and rebuild procedures:

