Cummins ISX11.9 CM2250 – Service Manual 006-017   Fuel Filter Head

The fuel filter head and electronic control module (ECM) cooling plate are combined into a single casting on the ISX11.9 CM2250 engine.

NOTE: The ports on the fuel filter head are labeled to indicate the fuel inlet or fuel outlet of the fuel filter.

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.

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

CAUTION  Clean all fittings before disassembly. Dirt or contaminants can damage the fuel system.

Before servicing any fuel system components, (such as fuel lines, fuel pump, injectors, etc.) which would expose the fuel system or internal engine component to potential contaminants prior to disassembly, clean the fittings, mounting hardware, and the area around the component to be removed. Dirt or contaminants can be introduced into the fuel system and engine if the surrounding areas are not cleaned, resulting in damage to the fuel system and engine. Refer to Procedure 000-009 in Section 0.

It is important to cover, cap, or plug any openings as soon as possible when servicing the fuel system in order to prevent engine damage.  Caps and plugs can be found in Clean Care Kit, Part Number 4919073.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

WARNING  Fuel is flammable. Keep all cigarettes, flames, pilot lights, arcing equipment, and switches out of the work area and areas sharing ventilation to reduce the possibility of severe personal injury or death when working on the fuel system.

WARNING  Drain the fuel-water separator into a container, and dispose of contents in accordance with local environmental regulations.

• Disconnect the batteries. Refer to the OEM service manual.
• Remove the electronic control module (ECM). Refer to Procedure 019-031 in Section 19.
• Remove the pressure side fuel filter. Refer to Procedure 006-065 in Section 6.
• If necessary, remove the fuel lift pump and associated fuel lines. Refer to Procedure 005-045 in Section 5.
• Disconnect the low-pressure fuel lines connecting the fuel filter head to the aftertreatment fuel shutoff valve manifold, fuel pump gear pump, and high-pressure fuel pump. Refer to Procedure 006-024 in Section 6.

Remove the fuel filter head mounting capscrews.

NOTE: Vibration isolators are located on the back of the ECM cooling plate. The vibration isolators are captive.

Remove the fuel pump gear pump supply line from the back of the fuel filter head. Refer to Procedure 006-024 in Section 6.

Remove the Compuchek™ fittings, OEM fuel supply fitting, and threaded plugs from the fuel filter head.

Inspect the Compuchek™ fittings, OEM fuel supply fitting, threaded plugs, and o-rings for damage.

Inspect the fuel filter head and ECM cooling plate for cracks, passage blockage, and material or debris on the sealing surfaces.

Inspect the fuel filter head for thread damage. Replace the fuel filter head if the threads are damaged.

Inspect the vibration isolators for damage.

Inspect the capscrews that secure the filter head to the cylinder block for damage to the sleeve or threads.

Replace any damaged components.

Install the Compuchek™ fitting and threaded plugs in the appropriate fuel filter head ports.

Install the OEM fuel supply fitting.

Install the fuel pump gear pump supply line to the back of the fuel filter head. Refer to Procedure 006-024 in Section 6.

Lubricate the vibration isolators with vegetable oil.

Insert the vibration isolators into the mounting holes in the fuel filter head, so that the thick portion of the isolator will face the engine block when the fuel filter head is installed.

Install the fuel filter head capscrews through the filter head casting and vibration isolators.

Tighten the retaining capscrews.

WARNING  Batteries can emit explosive gases. To reduce the possibility of personal injury, always ventilate the compartment before servicing the batteries. To reduce the possibility of arcing, remove the negative (-) battery cable first and attach the negative (-) battery cable last.

• Connect the low-pressure fuel lines connecting the fuel filter head to the aftertreatment fuel shutoff valve manifold, fuel pump gear pump, and high-pressure fuel pump. Refer to Procedure 006-024 in Section 6.
• If necessary, install the fuel lift pump and associated fuel lines. Refer to Procedure 005-045 in Section 5.
• Install a new pressure side fuel filter. Refer to Procedure 006-065 in Section 6.
• Install the ECM. Refer to Procedure 019-031 in Section 19.
• Connect the batteries. Refer to the OEM service manual.
• Operate the engine and check for leaks.