Fuel Rail and Injector Overview

Fuel Rail and Injector Overview






1 Fuel Injector

• With the combustion chamber seal (Teflon(R) seal), always replace.

• Replace O-rings.

• Note the correct installed position.

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

2 Support Ring

3 Fuel Rail

• Removing and installing, refer to => [ Fuel Rail, Separating from the Intake Manifold ] Intake Manifold with Fuel Rail.

4 High Pressure Pump

• With the fuel pressure regulator valve.

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

• Make sure dirt does not enter the fuel system when installing the high pressure pump.

• The fuel system must be without pressure to install the high pressure pump, releasing the high side fuel pressure. Refer to => [ High Side Fuel Pressure, Releasing ] Service and Repair.

• Install the fuel lines free of tension.

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

• High pressure pump overview. Refer to => [ High Pressure Pump Overview ] High Pressure Pump Overview.

5 Cam Follower

6 Fuel Pressure Regulator Valve (N276)

7 Bolt

• M6 threads = 8 Nm + an additional 90° (1/4) turn.

• M8 threads = 20 Nm.

• Always replace.

8 Fuel Supply Line Connection

• 22 Nm

• Always replace.

9 Fuel Supply Line to Fuel Rail

• 18 Nm

10 Channel Separating Plates

11 Seal

• Always replace.

12 Intake Manifold

• Removing and installing, refer to => [ Intake Manifold with Fuel Rail ] Intake Manifold with Fuel Rail.

13 Vacuum Diaphragm for the Channel Separating Plate

• Checking, refer to => [ Variable Intake Manifold, Checking ] Testing and Inspection.

14 Throttle Valve Control Module (J338)

• With the EPC throttle drive, the EPC throttle drive angle sensor 1 and the EPC throttle drive angle sensor 2.

• After replacing the throttle valve control module, it must be readapted to the Engine Control Module (ECM). Refer to "Guided Functions" in the vehicle diagnostic tester.

15 Bolt

• Tighten to 3 Nm, and then tighten to 9 Nm.

16 Intake Manifold Runner Position Sensor (G336)

• To remove and install, remove the intake manifold. Refer to => [ Intake Manifold with Fuel Rail ] Intake Manifold with Fuel Rail.

17 Fuel Pressure Sensor (G247)

• 27 Nm

• Coat the threads with clean engine oil.

• Checking, refer to => [ Fuel Pressure Sensor, Checking ] Testing and Inspection.

• Removing and installing, refer to => [ Fuel Pressure Sensor G247 ] Service and Repair.

Additional Tightening Specifications

Additional tightening specifications can be found at the end of the procedure "Fuel Rail, Separating from Intake Manifold". Refer to => [ Fuel Rail, Separating from the Intake Manifold ] Intake Manifold with Fuel Rail.