Removal of the Hydrocarbon Fuel Doser Injector Valve Fuel
Supply Line
1. Shut off engine and apply the parking brake, chock the wheels, and perform any other applicable safety
steps.
2. Open the hood.
To avoid injury from electrical shock, use care when connecting battery cables. The magnetic switch
studs are at battery voltage.
3. Disconnect the batteries.
4. If equipped, remove the protection cover (1) for the Hydrocarbon (HC) fuel doser injector valve.
5. Disconnect the HC fuel doser injector valve fuel supply line (1) from the HC fuel doser injector valve. Hold
the HC fuel doser injector valve with a wrench when loosening the line fitting.
6. Remove the two mounting clips that secure the HC doser valve coolant inlet, coolant outlet and HC fuel
doser injector valve fuel supply line to the side of the block.
7. Remove the two P-clip bolts securing the HC fuel doser injector valve fuel supply line to the flywheel
housing.
8. Disconnect the HC fuel doser injector valve fuel supply line (2) from the doser block assembly. Discard the
seal rings.
Inspection of the Hydrocarbon Fuel Doser Injector Valve Fuel
Supply Line
1. Inspect the Hydrocarbon (HC) fuel doser injector valve fuel supply line for a bent or cracked line. Replace
as needed.
2. Inspect the Hydrocarbon (HC) fuel doser injector valve fuel supply line for blockages. Flush the line if
needed.
Installation of the Hydrocarbon Fuel Doser Injector Valve Fuel
Supply Line
1. Using new seal rings, connect the Hydrocarbon (HC) fuel doser injector valve fuel supply line (2) to the
doser block assembly. Torque the banjo bolt to 15 N·m (11 lb·ft).
2. Install the two P-clip bolts securing the HC fuel doser injector valve fuel supply line to the flywheel housing.
Torque bolt to 25 N·m (18 lb·ft).
3. Install the two mounting clips that secure the HC doser valve coolant inlet, coolant outlet, and HC fuel doser
injector valve fuel supply line to the side of the block. Torque bolt to 25 N·m (18 lb·ft).
4. Connect the HC fuel doser injector valve fuel supply line (1) to the HC fuel doser injector valve. Hold the HC
fuel doser injector valve with a wrench when tightening the line fitting. Torque the line to 18 N·m (13 lb·ft).
5. If equipped, install the protective cover (1). Torque bolts to 10 N·m (7 lb·ft).
6. Connect the batteries.
7. Close the hood.
8. Start the engine.
9. Perform a Fuel Doser Purge service routine using DiagnosticLink®. Use the HC Doser command to run the
purge function in DiagnosticLink to purge all the air from the HC fuel doser valve and line.
10. Check for any leaks.