Repair Procedures

Step-by-step guides with detailed instructions, photos, and torque specifications

All Maintenance Engine Drivetrain Electrical Brakes Suspension HVAC Body Fuel System

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Fuel Systembeginner45

Fuel Filter Replacement — OM646 (2.1L CDI)

Replace the engine-mounted spin-on fuel filter on the OM646 four-cylinder NCV3 Sprinter. Different housing, different procedure, and a different prime sequence than the OM642 V6 — get it wrong and the high-pressure pump can pull air and fail to start.