2007 Lexus GS 450hFACTORY OEM SERVICE PROCEDURE

Fuel System: Precaution

CAUTION:
  • Before working on the fuel system, disconnect the cable from the negative (-) battery terminal.
  • Do not smoke or be near an open flame when working on the fuel system.
  • Keep gasoline away from rubber or leather parts.
  • Do not allow fuel to spray when removing the pipe between the high pressure side fuel pump and the fuel injector. The fuel in the pipe is highly pressurized.
  1. DISCHARGE FUEL SYSTEM PRESSURE 
    CAUTION:
    • Do not disconnect any part of the fuel system until you have discharged the fuel system pressure.
    • Even after discharging the fuel pressure, place a piece of cloth or equivalent over fittings as you separate them to reduce the risk of fuel spray on yourself or in the engine compartment.
    1. Connect the intelligent tester to the DLC3.
    2. Set the vehicle to the "INSPECTION MODE" (see INSPECTION MODE PROCEDURE ).
    3. Start the engine.
      Fig 1: Connecting Intelligent Tester To DLC3
      G05303079Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Disconnect the fuel pump connector.
      Fig 2: Locating Fuel Pump Connector
      G05303080Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. After the engine has stopped on its own, turn the power switch OFF.

      HINT:

      DTC P3190, P3191, P0171, P0172 and/or P0A0F may be set.

    6. Loosen the fuel tank cap, then discharge the pressure in the fuel tank completely.
    7. Connect the fuel pump connector.
  2. FUEL SYSTEM 
    1. When disconnecting the fuel pressure line, a large amount of gasoline will spill out. Follow the following procedures:
      1. Discharge the fuel system pressure.
      2. Put a container under the connection.
      3. Disconnect the fuel pump tube.
      4. Drain the fuel remaining inside the fuel pump tube into the container.
      5. To protect the disconnected fuel pump tube from damage and contamination, cover it with a plastic bag.
        Fig 3: Covering Fuel Pump Tube With Plastic Bag
        G04947836Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Observe the following precautions when disconnecting the fuel tube connector (quick type A).
      1. With fuel pipe clamp type:

        Remove the fuel pipe clamp.

      2. Check for foreign matter on the pipe and around the connector before disconnecting it. Clean it if necessary.
        Fig 4: Identifying Fuel Tube Connector
        G04947837Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. If the connector and pipe are stuck, pinch the connector, and push and pull the pipe to disconnect them.
        NOTE: Do not use any tools in this procedure.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.