Genuine Mercedes-Benz C320 Fuel Rail

Mercedes-Benz C320 Fuel Rail Parts and Q&A

• Fuel Rail
  112-070-02-95
  Q: How to handle Fuel Injector and Fuel Rail on V6 on Mercedes-Benz C320?

  A:

  For V6 models, the fuel rail and injector assembly used on 2001 through 2005 models is depicted, while 2006 and later models have a slightly different assembly that can still be serviced using the same procedure. Begin by removing the engine cover and air filter housing, then relieve the fuel system pressure and disconnect the negative battery terminal. For models with a remote air filter housing, remove the air intake duct and resonator. Disconnect the Exhaust Gas Recirculation (EGR) purge line from the Throttle Body and detach the plastic covers from the fuel injector/ignition coil harness. On 2001 through 2005 models, disconnect the engine harness from various components, including fuel injectors and ignition coils, and set the harness aside. For 2006 and later models, disconnect the right electrical connector from the Powertrain Control Module (PCM) without disconnecting the left connector, then detach the PCM and harness. Disconnect the fuel supply hose fitting from the fuel rail and remove the fuel rail mounting bolts. Remove the fuel rail and injectors as a single assembly, then remove each injector retainer clip and the injector from the fuel rail, discarding the old O-rings and replacing them with new ones. Install the retainer clip on each injector, align it with the mounting hole, and insert the injector until the retainer snaps into place. Push each injector down until fully engaged. Installation is the reverse of removal. For four-cylinder models, start by removing the engine trim panels, relieving fuel system pressure, and disconnecting the negative battery terminal. Remove the locking clamp and pulsation damper, then the O-ring, ensuring to use a new one during installation. Disconnect the fuel supply line and electrical connectors from the fuel injectors, remove the fuel rail mounting bolts, and take out the fuel rail and injectors as a single assembly. Remove the injector retainer clips and discard old O-rings, replacing them with new ones. Install the retainer clips, align them with the mounting holes, and push the injectors down until fully engaged. Installation is the reverse of removal. For 2003 through 2005 models, the procedure for the pulsation damper is similar to that of the 2002 models, followed by disconnecting the fuel supply line, detaching the fuel injector harness clip, and removing the fuel rail and injectors as previously described, ensuring to replace old O-rings with new ones and completing the installation in reverse order.