Replacing the Fuel Line For the Engine Coolant Heater

Replacing the fuel line for the engine coolant heater

Special tools:
951 2619 Pliers 951 2619 Pliers

As 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.

Preparations

Remove:
- the splash guard under the engine
- the air baffles
- the wind deflectors.

Removing the fuel line for the engine coolant heater

Warning! Protective gloves and protective goggles must be used for the following operations. This is due to the risk of fuel spillage.





Remove:
- the quick-release connector at the rear edge of the sub-frame
- the hose clamp for the heater.

Hint: Use special tool 951 2619 Pliers 951 2619 Pliers (Oetiker pliers) to remove and to fasten the clamps.

Pull the pipe loose from the clip.





Remove:
- the cover over the fuel line. Move the clips to one side.




- the quick-release connector and the hose clamp for the fuel hoses.
Plug the hoses.





Remove:
- the rear seat cushion. See Upholstery, seat cushion, replacing Upholstery, Seat Cushion, Replacing
- the insulation
- the four nuts
- the inspection hatch for the fuel tank unit.
Disconnect the quick-release connector (as illustrated). Pull up the fuel hose.

Installing the fuel line for the engine coolant heater
Install the fuel line.
Connect the fuel line to the fuel pump (FP).
Check that the tilt angle on the fuel pump (FP) is 15°.
Connect the fuel line from the fuel pump (FP) and forward to the sub-frame and fuel line.
Install the fuel line on the clip and the fuel terminals.

Final check

Note! Start the engine and let it idle for a few seconds before starting the heater.

Test run the heater. Check the function of the heater. See Engine coolant heater, test running Engine Coolant Heater, Test Running.
Check for leakage in the engine coolant hoses or fuel lines.
Top up the coolant if necessary.
Check that no diagnostic trouble codes (DTC) have been stored during the repair work.
Screw the inspection hatch for the fuel tank unit into place.

Install:
- the insulation and the cushion
- the splash guard under the engine
- the air baffle
- the wind deflectors.