Cummins ISX11.9 CM2250 – Service Manual 011-052   Aftertreatment Fuel Shutoff Manifold

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

• Make sure the area around the fuel shutoff manifold is clear of debris. Use compressed air to clean the area and remove any loose dirt particles.
• Disconnect the wiring harness from the aftertreatment fuel shutoff valve and the aftertreatment fuel pressure sensor. Refer to Procedure 019-444 in Section 19.
• Disconnect and remove the aftertreatment injector fuel supply line at the inlet of the aftertreatment fuel shutoff manifold. Refer to Procedure 011-051 in Section 11.
• Disconnect and remove the aftertreatment injector fuel supply line at the outlet of the aftertreatment fuel shutoff manifold. Refer to Procedure 011-051 in Section 11.
• Disconnect and remove the aftertreatment fuel shutoff manifold air supply line. Refer to Procedure 011-067 in Section 11.

Remove the two mounting capscrews.

Remove the fuel shutoff manifold.

Remove the aftertreatment fuel shutoff valve (1), and aftertreatment pressure sensor (2) with a 1-1/8 inch open end wrench.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

Clean the aftertreatment fuel shutoff valve and aftertreatment fuel pressure sensor with safety solvent.

Inspect the o-ring for cuts or wear. Replace the o-ring if necessary.

Inspect the threads for damage.

Replace and damaged components.

WARNING  When using solvents, acids, or alkaline materials for cleaning, follow the manufacturer’s recommendations for use. Wear goggles and protective clothing to reduce the possibility of personal injury.

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

Clean the aftertreatment fuel shutoff manifold with safety solvent.

Use compressed air to clean the aftertreatment fuel shutoff manifold and remove any debris.

Make sure the filter screen and orifice are in the fuel inlet side of the aftertreatment fuel shutoff valve manifold.

Inspect the threads of the aftertreatment fuel shutoff manifold for damage. If the threads are damaged, replace the aftertreatment fuel shutoff assembly (the assembly consists of the aftertreatment fuel shutoff manifold, the aftertreatment fuel shutoff valve, and the aftertreatment fuel pressure sensor).

Inspect the capscrews for damaged threads, corroded surfaces, or a reduced shank diameter (capscrew stretching).

Install the pressure sensor and the fuel shutoff valve.

Install the two capscrews to attach the aftertreatment fuel shutoff manifold to the bracket on the engine.

• Install the aftertreatment injector fuel supply line at the inlet of the aftertreatment fuel shutoff manifold. Refer to Procedure 011-051 in Section 11.
• Install the aftertreatment injector fuel supply line at the outlet of the aftertreatment fuel shutoff manifold. Refer to Procedure 011-051 in Section 11.
• Install the aftertreatment fuel shutoff manifold air supply line.  Refer to Procedure 011-067 in Section 11.
• Connect the wiring harness to the aftertreatment fuel shutoff valve, fuel drain valve, and aftertreatment fuel pressure sensor. Refer to Procedure 019-444 in Section 19.
• Operate the engine and check for leaks.