GMC Workshop Service and Repair Manuals

Fuel Filter: Service and Repair
Fuel Filter Replacement

Fuel Filter Replacement

Removal Procedure

1. Drain the fuel from the primary filter and the diesel fuel conditioning module (DFCM). Refer to Water-in-Fuel Draining.

2. Unscrew the primary fuel filter.
3. Unscrew the DFCM lower housing.
4. Remove both filters.

Installation Procedure

1. Install the new O-ring seal to the DFCM lower housing.