Auxiliary Cabin Heater Fuel Pump: Service and Repair

Fuel pump auxiliary heater, replacing

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.

Removing the fuel pump (FP) 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.

The fuel pump (FP) is located against the front right-hand side of the fuel tank.

Note! Note the tilt angle on the fuel pump (FP), 15°. It is important for the pump function that the angle is correct.

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

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

Plug the hoses.
Disconnect the fuel pump connector.
Remove one nut retaining the pump holder.

Installing the fuel pump (FP) for the engine coolant heater
Install the fuel pump (FP) unit nut and tighten the nut to an angle of 15°. Tighten to 3 Nm.

Install:
- the connector
- the fuel lines.
Complete rustproofing.

Final check
Test run the heater. Check the function of the heater. See Engine coolant heater, test running Component Tests and General Diagnostics.
Check for leakage in the engine coolant hoses or fuel lines.
Check that no diagnostic trouble codes (DTC) have been stored during the repair work.