High Pressure Pump Assembly Overview

High Pressure Pump Assembly Overview

Fuel system is under high pressure! Before opening the system, perform the procedure for releasing fuel pressure. Refer to => [ Before Opening High Pressure Fuel Injection System ] Service and Repair.






1 - Air Deflector Plates

• Removable

• Check for damages and correct positioning

2 - Sleeve

• remains inserted in cylinder head after removing the high-pressure pump, removable

3 - O-Ring

• Replace

4 - Mechanical Single-Piston High-Pressure Pump

• An electrical fuel pump, located in the fuel tank, supplies fuel to the mechanical high-pressure pump at a pressure of approximately 6 bar.

• When installing the high-pressure pump, make sure that no dirt enters the fuel system.

• The fuel system must be pressureless, releasing fuel pressure, refer to => [ Before Opening High Pressure Fuel Injection System ] Service and Repair

• Do not install fuel lines with tension

• Removing and installing, refer to => [ High Pressure Pump ] High Pressure Pump

5 - Fuel Pressure Regulator Valve (N276)

6 - Low Fuel Pressure Sensor (G410)

• 15 Nm

7 - High-Pressure Pump Bolts

• 10 Nm

8 - Fuel Return Line to Fuel Tank Connection

• When replacing threaded supports, always leave old sealing ring in pump. It is pinched during initial assembly by the supplier and cannot be removed. The threaded support has a "biting edge" for sealing for this purpose.

9 - Fuel Supply Line to Fuel Rail Connection

• Replace connecting piece

• Tighten connections to 30 Nm

• Do not install fuel line with tension (ensure cleanliness), tightening specifications: 27 Nm

10 - Hole In Cylinder Head For High-Pressure Pump

11 - Fuel Injector

• Replace O-rings

• Note correct installation position

• Removing and installing, refer to => [ Fuel Injectors ] Fuel Injectors