Fuel Rail Overview

Fuel Rail Overview






1 Fuel Injector

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

• Replace the 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 electrical fuel pump located in the fuel tank supplies fuel to the 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 pressureless to install the high pressure pump, releasing the fuel pressure, refer to => [ High Side Fuel Pressure, Releasing ] Service and Repair.

• Do not install fuel lines with tension.

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

5 Roller Tappet

6 Fuel Pressure Regulator Valve (N276)

7 Bolts

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

• M8 thread = 20 Nm.

• Always replace.

8 Connection, Fuel Supply Line

• 22 Nm

• Always replace.

9 Fuel Supply Line Union Nut

• 18 Nm

10 Channel Separating Plates

11 Gasket

• 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 ] Variable Intake Manifold, Checking.

14 Throttle Valve Control Module (J338) , Electronic Power Control (EPC) Throttle Drive (G186)

• EPC throttle drive angle sensor 1 (G187) and EPC throttle drive angle sensor 2 (G188).

• After replacing the throttle valve control module, it must be readapted to the engine control module (J623). 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

• Lubricate the threads with clean engine oil.

• Checking, refer to => [ Fuel Pressure Sensor (G247), Checking ] Fuel Pressure Sensor (G247), Checking.

• 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 => [ Fuel Rail, Separating from the Intake Manifold ] Intake Manifold with Fuel Rail.