FUEL SYSTEM


  1. CONSTRUCTION


    1. The function of the common-rail is to store the fuel that has been pressurized by the supply pump assembly.

    2. The common-rail assembly is provided with a fuel pressure sensor and pressure discharge valve.

    3. The fuel pressure sensor detects the fuel pressure in the common-rail assembly.

    4. The pressure discharge valve regulates the fuel pressure. In the pressure discharge valve, the plunger opens and closes in accordance with the actuation signals from the injector driver. Thus, it regulates pressure by releasing excess pressure from the common-rail assembly. In addition, it has a pressure reduction function in case of emergency.

    5. Internally, the common-rail assembly contains a main hole and 5 branch holes that intersect the main hole. Each branch hole functions as an orifice that dampens the fluctuation of the fuel pressure.

      B002N7PC01
      *1 Common-rail Assembly *2 Fuel Pressure Sensor
      *3 Pressure Discharge Valve *4 Branch Hole
      *5 Main Hole - -
      B002NKU From Supply Pump Assembly B002N8P To Injector Assembly
      B002N2T To Fuel Tank (Excess Pressure) - -

      Tech Tips


      • The fuel pressure sensor has its sealing portion plastic-deformed in order to keep sealing performance, so do not reuse it after disassembling.

      • If parts that affect the alignment have been changed, make sure to replace the pipe with a new one as well. The parts that require the replacement of a pipe are listed below:


        • Injection pipe: injector, common-rail, and cylinder head

        • Fuel inlet pipe: supply pump, common-rail, cylinder block, cylinder head, cylinder head gasket and timing gear case

      • For details, refer to the Repair Manual.