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 - Channel Separating Plate

• Removable

• Check for damages and correct positioning

2 - Valve Lifter

• Remains inserted in the vacuum pump after removing the high-pressure pump, removable

3 - O-ring

• Replace

4 - 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 - Bolts for High-Pressure Pump

• 10 Nm

8 - Connection for Fuel Return Line to Fuel Tank

• There is also high pressure pumps with a hose 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.

• Replace the banjo bolt for the fuel return

• Tighten connection to 40 Nm (before each installation of the fuel line, check the torque of the connection)

• Do not install fuel return line with tension (be aware of cleanliness) Torque specification: 17 Nm

9 - Connection for the Fuel Supply Line to the Fuel Rail

• Tighten connection to 30 Nm (before each installation of the fuel line, check the torque of the connection)

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

10 - Opening in the Vacuum Pump for the High Pressure Pump

11 - Fuel Injector

• Replace O-rings

• Note correct installation position

• Removing and installing, refer to => [ Teflon Combustion Chamber Seal ] Teflon Combustion Chamber Seal