CM850 Electronic Control System – 019-102   Fuel Control Valve

Check the electronic fuel control actuator for an audible click after a key-on-key-off cycle. If no audible click is heard at key-off, measure the resistance of the electronic fuel control actuator valve.

NOTE: The electronic fuel control (EFC) actuator can also be checked using an INSITE™ electronic service tool. Refer to the OEM service manual for instructions.

WARNING  Wear appropriate eye and face protection when using compressed air. Flying debris and dirt can cause personal injury.

WARNING  When using a steam cleaner, wear safety glasses or a face shield, as well as protective clothing. Hot steam can cause serious personal injury.

Steam-clean the fuel pump and the area around the fuel pump.

Dry with compressed air.

Measure the resistance of the electronic fuel control actuator valve. The maximum resistance is 5 ohms.

Remove the low-pressure supply lines. Refer to Procedure 006-024.

Remove the capscrews and electronic fuel control actuator.

CAUTION  Do not pause more than two minutes between Torque Steps 1 and 2. This can cause the capscrews not to maintain their torque value. Leakage or engine damage can result.

NOTE: Lubricate the new o-ring with clean oil before installation.

Install a new o-ring on the electric fuel control actuator.

Install the electronic fuel control actuator and capscrews, and tighten.

NOTE: Be sure that the electronic fuel control actuator flange is flush with the mounting surface on the fuel pump.

NOTE: New capscrews must be used each time the electronic fuel control actuator is installed. The capscrews are coated with an encapsulated thread sealant that is activated in Step 1 of the tightening procedure.

Install the low-pressure fuel supply lines. Refer to Procedure 006-024.

Operate the engine and check for leaks or fault codes.