Fuel Delivery and Air Induction

Diesel Direct Fuel Injection System Overview

• Follow the guidelines for a clean working environment when working on the fuel system. Refer to => [ Clean Working Conditions ] Clean Working Conditions.

• Always follow these rules before and during work.

• If the fuel system components between the fuel tank and high pressure fuel pump were removed or replaced, the fuel system must be filled in order to bleed it. Refer to => [ Fuel System, Filling and Bleeding ] Fuel System, Filling and Bleeding. (Never allow the high pressure pump to run dry).

The control module for the diesel direct fuel injection system is equipped with a Diagnostic Trouble Code (DTC) memory. Before and after repairs or adjustments, the DTC memory must be checked. Refer to the vehicle diagnostic tester.






1 Fuel Tank

• With the transfer fuel pump.

2 Fuel Filter

• With a pre-heater valve.

3 Not Equipped

4 Filter

5 Fuel Temperature Sensor (G81)

6 High Pressure Pump

• After replacing, the fuel tank must be filled (never run dry). Refer to => [ Fuel System, Filling and Bleeding ] Fuel System, Filling and Bleeding.

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

7 Fuel Metering Valve (N290)

• Must not be removed.

8 Fuel Pressure Regulator Valve (N276)

• Removing and installing, refer to => [ Fuel Pressure Regulator Valve N276 ] Service and Repair.

9 Fuel Rail (High Pressure Reservoir)

10 Fuel Pressure Sensor (G247)

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

11 Check Valve

• Can be replaced complete only with the fuel return lines.

• The engine must run at idle for approximately two minutes after replacing to bleed the fuel system.

12 Fuel Injector

• Cylinder 1 fuel injector (N30).

• Cylinder 2 fuel injector (N31).

• Cylinder 3 fuel injector (N32).

• Cylinder 4 fuel injector (N33).

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