Auxiliary Cabin Heater Fuel Hose/Line: Service and Repair

Fuel line fuel-powered preheater

Special tools:
951 2619 Pliers 951 2619 Pliers

Note! The illustrations in this service information are used for different model years and/or models. Some variation may occur. However, the essential information in the illustrations is always correct.

Preparatory work

Important information

Warning! Use protective gloves and protective goggles during all operations due to the risk of fuel spills.

Note! There must be no dirt present when handling fuel line connections.

Method content

This method consists of:
- front, replacing
- center, replacing
- fuel tank, replacing.

Fuel pipe, front, replacing

Removing the front fuel line





Remove:
- the EVAP canister pipe (1)
- the upper charge air pipe (2).




Remove the lower mounting for the fuel pipe.
Disconnect the quick-release connector.

Note! Wipe up any fuel spills.




Disconnect the intake hose (1).
Disconnect the exhaust system (2) but do not remove it. See: Fuel Fired Booster Heater Exhaust Pipe, B5254T7, L.H.D Service and Repair.

Remove:
- the fuel pipe (3) from the clip mounting
- the mounting screw (4). Angle the engine coolant heater out slightly.
Place paper around the upper fuel connection on the engine coolant heater.
Disconnect the fuel hose.

Hint: Use: 951 2619 Pliers 951 2619 Pliers to release the clamps.

Lift up and remove the fuel line.

Installing the front fuel line
Position the fuel line.
Install the upper fuel connection using a new clamp.

Hint: Use: 951 2619 Pliers 951 2619 Pliers to secure the clamp.

Secure the engine coolant heater in the bracket. Tighten. See: Tightening torque [1][2]Body and Frame.

Install:
- the fuel pipe in the clip mounting
- the exhaust system. See: Fuel Fired Booster Heater Exhaust Pipe, B5254T7, L.H.D Service and Repair
- the intake hose
- the lower quick-release connector for the fuel pipe. Secure the fuel pipe in the lower mounting.

Note! Wipe up any fuel spills.

Carry out finishing work. See Finishing.

Fuel line, center, replacing

Removing the center fuel line
Raise the vehicle.
Remove the front and rear quick-release connectors for the fuel line.
Disconnect the fuel line from the mounting points. Route the fuel line back under the front SIPS member.

Installing the center fuel line
Route the fuel line under the front SIPS member. Secure the fuel line in the mounting points.
Install the front and rear quick-release connectors for the fuel line.
Carry out finishing work. See Finishing.

Suction pipe, fuel tank, replacing

Removing the suction pipe




Remove the fuel tank. See: Fuel tank, B5254T7 Removal and Replacement.




Place paper around the suction pipe connection to the fuel tank unit.
Release the quick-release connector to the suction pipe.
Lift the suction pipe.

Installing the suction pipe
Press down the suction hose.
Connect the quick-release connector for the fuel line. A click must be clearly heard.

Note! Wipe up any fuel spills.

Reinstall the fuel tank. See: Fuel tank, B5254T7 Removal and Replacement.
Carry out finishing work. See Finishing.

Finishing

Testing the engine coolant heater
Carry out a performance test of the engine coolant heater. See: Fuel-powered preheater, checking Fuel-Powered Preheater, Checking.