Cummins ISX11.9 CM2250 – Service Manual 006-013   Fuel Drain Lines

Inspect the fuel drain lines for any signs of leaks, cracks, fretting, and loose or broken brackets.

Repair or replace any damaged parts.

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.

• Disconnect the batteries. Refer to the OEM service manual.

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.

Clean the fuel drain line and mating components with contact cleaner, Part Number 3824510, or equivalent.

To prevent damage from debris and contamination, cover, cap, or plug any openings as soon as possible when servicing the fuel system.  Caps and plugs can be found in Clean Care Kit, Part Number 4919073.

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  Do not vent the fuel system on a hot engine; this can cause fuel to spill onto a hot exhaust manifold, which can cause a fire.

Each drain line connects to the drain manifold using an M12 banjo bolt.

The injector drain connects at the back of the cylinder head (1) using an M12 banjo bolt style check valve.

The fuel rail pressure relief valve drain line (2) connects to the fuel rail pressure relief valve using an M16 banjo bolt.

The fuel pump drain (3) connects to the fuel pump head using an M16 banjo bolt.

Remove the p-clip capscrews, stud, banjo bolts, check valve, and sealing washers.

Remove the fuel drain lines.

Inspect the p-clips, drain lines, and banjo fittings for damage.

Replace any damaged components.

Install the drain lines on the engine.

Loosely install the p-clip capscrews, stud,  banjo fittings, banjo style check valve, and new sealing washers for each drain line.

Tighten the p-clip capscrews, banjo bolts, and banjo style check valve.

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 batteries. Refer to the OEM service manual.
• Operate the engine and check for leaks.