Auxiliary Cabin Heater Fuel Pump: Service and Repair

Fuel pump, auxiliary heater, replacing

The information below applies to cars manufactured up to week 38 2001 inclusive.

Information for cars manufactured from week 39 2001 inclusive. See Fuel pump auxiliary heater, replacing Service and Repair

Removal

Preparations
Remove the heater. See Engine coolant heater, replacing Engine Coolant Heater, Replacing.
Remove the control module. See Control module, engine coolant heater, replacing Service and Repair.

Fuel line and fuel pump

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




Remove the hose clamp from the fuel hose.
Disconnect the fuel pump connector.

Note! Use Oetiker pincers 3374 to slacken off and secure the Oetiker clamps.




Remove the 2 nuts retaining the pump holder.
Hold the damper while removing the fuel pump (FP).

Installation

Fuel pump and fuel line
Reinstall in reverse order.
Torque tighten the nut 3 Nm.

Bleeding the fuel system
Connect the fuel line to a vacuum pump. Suck carefully until fuel comes out. Connect the cables and hoses.

Note! Always check that there is clearance between the fuel line and water hose.

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 both the coolant hoses and the fuel lines for leakage.
Top up the coolant if necessary.
Check that no diagnostic trouble codes (DTC) have been stored during the repair work.