Auxiliary Cabin Heater Fuel Pump: Service and Repair

AR83.70-P-5652T Remove/Install Fuel Metering Pump
- with CODE (228) Stationary heater







1 Disconnect battery ground line
2 Unplug electrical connector (2)
3 Disconnect fuel hoses (1) with clamps (3)
- See "Special Tools" given below.

4 Disconnect fuel hoses (1) at the STH fuel metering pump (Y23)

NOTE: Collect escaping fuel with a cloth.

5 Remove STH fuel metering pump (Y23) from the rubber mounts (4)

NOTE: Installation: observe direction of installation.

6 Install in the reverse order.

NOTE: Ensure that the fuel hoses (1) are securely seated and not leaking.

DANGER:
- Risk of explosion from fuel vapors, risk of poisoning from inhaling combustion gases and risk of injury from burns during and after operation of heater unit
- Do not operate stationary heater, auxiliary heater or engine with heater booster in closed areas or when refueling. Allow heater unit to cool down after operation and wear protective gloves.

7 Start up stationary heater
- If the STH heater switches off automatically before reaching its operating temperature and cannot be restarted again, a fault interlock is present, To clear a fault interlock, refer to Star Diagnosis.

Special Tools

Clamp, P/N# 000 589 40 37 00: