Fuel System
Fuel delivery and injection systems
beginner45
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.
intermediate60 minutes
Fuel Filter Service — Mercedes Sprinter Model 907 (OM642)
Replace the in-frame diesel fuel filter on the OM642 to prevent injector wear, improve cold-start behavior, and keep the high-pressure fuel system clean. Includes priming and air-bleed steps.
intermediate60
OM651 Main Fuel Filter Remove/Install — NCV3
Workshop-style remove-and-install procedure for the main fuel filter on Mercedes-Benz OM651 four-cylinder diesel engines fitted to the NCV3 Sprinter (Model 906) and late T1N (Model 900). Covers click-clamp removal, condensation-sensor handling, the installation arrow, and the leak-test run.