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Fuel System (3MZ-FE): Precaution

  1. PRECAUTION 
    1. Before working on fuel system, disconnect negative (-) battery cable.
    2. Do not smoke or work near fire when handling the fuel system.
    3. Keep gasoline away from rubber or leather parts.
  2. DISCHARGE FUEL SYSTEM PRESSURE 
    CAUTION:
    • Do not disconnect any part of the fuel system pressure until you have discharged the fuel system pressure.
    • Ever after discharge the fuel pressure, place a shop rag over fittings as you separate them to reduce risk of fuel spray on yourself or in the engine compartment.
    Fig 1: Disconnecting Fuel Pump Connector
    G00902332Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the fuel pump connector.
    2. Start the engine. After the engine has stopped, turn the ignition switch OFF.
    3. Disconnect negative (-) battery cable.
    4. Connect the fuel pump connector.
  3. FUEL SYSTEM 
    1. When disconnecting the high fuel pressure line, a large amount of gasoline will spill out, so observe these procedures.
      1. Discharge the pressure in the fuel system.
      2. Disconnect the fuel pump tube.

        (See Removal & Installation and Disassembly & Reassembly  )

      3. Drain the fuel that remained inside the fuel pump tube.
      4. To prevent the disconnected fuel pump tube from being damaged and foreign objects from being introduced, cover with a vinyl or plastic bag.
      5. Place a tray under the vehicle or point of disconnection to catch any fuel that may spill.
        Fig 2: Protecting Fuel Pump Tube
        G00902333Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Observe the following precautions when removing and installing the fuel injectors.
      NOTE: Never reuse the O-ring.
      1. When installing a new O-ring on the injector, be careful not to damage it.
      2. Coat new O-ring with grease or gasoline before installing. Never use engine oil, gear oil or brake oil.
      Fig 3: Identifying Injectors Grommet And O-Ring
      G00902334Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Install the injector to the delivery pipe and cylinder head as shown in the illustration. Before installing the injector, be sure to apply grease or gasoline on the place where the delivery pipe contacts the O-ring of the injector.
      Fig 4: Installing Injector To Delivery Pipe
      G00902335Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Observe these precautions when disconnecting the fuel tube connectors.
      1. Disconnect the fuel pipe clamp from the connector.
      2. Check if there is any dirt or mud on the pipe and around the connector before disconnecting then, and remove the dirt as necessary.
        Fig 5: Identifying Fuel Pump Pipe Clamp
        G00902336Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Disconnect the connector from the hose while pinching portion A with your fingers as shown in the illustration.
        Fig 6: Disconnecting Connector From Hose (1 Of 2)
        G00902337Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. If the connector and the pipe are stuck, pinch the fuel pipe, push and pull the connector to free to disconnect and pull it out. Do not use any tools.
        Fig 7: Disconnecting Connector From Hose (2 Of 2)
        G00902338Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. If there is dirt or any other substance on the sealing surface that might interfere with the seal, clean the area thoroughly before assembly.
      6. Prevent the disconnected pipe and connector from damage and dirt by covering them with a vinyl or plastic bag.
        Fig 8: Protecting Fuel Pipe And Connector
        G00902339Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Observe these precautions when connecting the fuel tube connector.
      1. Check that there is any damage or foreign objects in the connected part of the pipe.
      2. Align the axis of the connector with the axis of the pipe, and push into the connector until the connector makes a "click" sound. In case that the connection is tight, apply little amount of fresh engine oil on the tip of the pipe.
        Fig 9: Connecting Fuel Tube Connector
        G00902340Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. After having finished the connection, check if the pipe and the connector are securely connected by pulling on them.
      4. Install the fuel pipe clamp to the connector.
      5. Check if there is any fuel leakage.
        Fig 10: Checking Pipe And Connector Connection
        G00902341Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. CHECK FOR FUEL LEAKS 
    1. Check that there are no fuel leaks after doing maintenance anywhere on the fuel system. (See ON-VEHICLE INSPECTION  )
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