High Pressure Pump
- Camshaft
- Cam followers
- Cam, high pressure pump
- Vacuum pump
- O-ring
- Control valve, fuel flow
- Inlet
- Exhaust
The high pressure pump is installed on the vacuum pump housing. The high pressure pump's pumping action is achieved by a reciprocating piston. The piston rolls against a cam with four lobes. The cam is driven by the exhaust camshaft, which also operates the vacuum pump. A camshaft revolution thus gives four strokes. The cam lobes' lift height is 4 mm. The capacity per stroke is 0.283 cm3 (283 mm3).
The function of the high pressure pump is to control and create a pressure as high as is needed to enable the injectors to inject correct fuel volume in the combustion chamber during a certain time. Thus, the high pressure pump pressurizes the fuel to the fuel rail and then via injectors injects fuel into the combustion chamber. The high pressure pump is all stainless steel and does not have internal O-ring seals, which makes it even more durable. The pump can handle a system pressure of up to 20 MPa (200 bar).