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Home >> Toyota >> 2007 >> Prius Base >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> Engine Fuel System (1NZ-FXE) >> Fuel System >> Precaution

Fuel System: Precaution

  1. PRECAUTION 
    1. Before working on the fuel system, disconnect the cable from the negative (-) battery terminal.
      CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
    2. Do not work on the fuel system near fire. Never smoke while performing work.
    3. Keep rubber or leather parts away from gasoline.
  2. DISCHARGE FUEL SYSTEM PRESSURE 
    CAUTION:
    • Before removing the fuel system parts, take precautions to prevent gasoline spillage.
    • As some pressure remains in the fuel line even after taking precautions to prevent gasoline spillage, use a shop rag to prevent gasoline from spilling when disconnecting the fuel line.
    1. Set the vehicle to the "INSPECTION MODE1" (see INSPECTION MODE PROCEDURE ).
    2. Disconnect the cable from negative (-) battery terminal.
      CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to prevent airbag and seat belt pretensioner activation.
    3. Remove the rear seat cushion (see REMOVAL ).
    4. Remove the rear floor service hole cover.
    5. Disconnect the fuel pump connector.
    6. Connect the cable to the negative (-) battery terminal.
    7. Start the engine.
    8. After the engine stops (rough idle), turn the power switch OFF.

      HINT:

      DTC P0171 (system to lean) may be present.

    9. Crank the engine again, then check that the engine does not start.
    10. Remove the fuel tank cap, then discharge the pressure in the fuel tank completely.
      Fig 1: Disconnecting Fuel Pump Connector
      G04472811Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    11. Disconnect the cable from the negative (-) battery terminal.
    12. Connect the fuel pump connector.
    13. Install the rear floor service hole cover.
    14. Install the rear seat cushion (see INSTALLATION ).
    15. Connect the cable to the negative (-) battery terminal.
    16. Perform initialization (see INITIALIZATION ).
      NOTE: Certain systems need to be initialized after disconnecting and reconnecting the cable from the negative (-) battery terminal.
  3. FUEL SYSTEM 
    1. When disconnecting the high-pressure fuel line, a large amount of gasoline will spill out. So take the following precautions.
      1. Discharge the fuel system pressure (see REMOVAL ).
      2. Disconnect the fuel pump tube.
      3. Drain the pressure remaining in the fuel pump tube.
      4. Cover the disconnected fuel pump tube (fuel tube joint and fuel tube connector) with a plastic bag to prevent damage and intrusion of foreign objects.
        Fig 2: Covering Disconnected Fuel Pump Tube (Fuel Tube Joint And Fuel Tube Connector) With Plastic Bag
        G04472812Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Take the following precautions when removing and installing the fuel injector.
      1. Do not reuse the O-ring.
      2. Do not damage a new O-ring when installing it to the fuel injector.
      3. Before installing a new O-ring, apply spindle oil or gasoline.
        NOTE: Do not use engine oil, gear oil or brake oil.
        Fig 3: Precautions For Removing And Installing Fuel Injector
        G04472813Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Install the fuel injector to the fuel delivery pipe and cylinder head as shown in Fig 4.
      NOTE: Apply spindle oil or gasoline to the contact surface of the fuel delivery pipe and fuel injector before installing the fuel injector.
      Fig 4: Installing Fuel Injector To Fuel Delivery Pipe And Cylinder Head
      G04472814Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Take the following precautions when removing the fuel tube connector (Type A).
      1. Check the fuel tube connector and pipe for dirt or mud before removing the fuel tube connector. If they are dirty, wipe them off with a shop rag.
      2. Pinch the retainer as shown in Fig 5, then pull out the fuel tube connector from the pipe.
        Fig 5: Precautions For Removing Fuel Tube Connector (Type A)
        G04472815Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. If the fuel tube connector and pipe are stuck, pinch the pipe, then push and pull the fuel tube connector to release and disconnect the fuel tube connector.
        NOTE: Do not use any tools.
      4. After removing the fuel tube, check the sealing surface of the pipe for dirt or mud.

        If it dirty, wipe it off with a shop rag.

        Fig 6: Disconnecting Fuel Tube Connector
        G04472816Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. Cover the disconnected fuel tube connector and pipe with a plastic bag to prevent damage and intrusion of foreign objects.
        Fig 7: Covering Disconnected Fuel Tube Connector And Pipe Using Plastic Bag
        G04472817Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Take the following precautions when installing the fuel tube connector (Type A).
      1. Align the fuel tube connector with the pipe, then push in the fuel tube connector until the retainer makes a "click" sound.

        HINT:

        If they are connected too tightly, apply a light coat of engine oil to the tip of the pipe, then install the fuel tube connector.

        Fig 8: Pushing In Fuel Tube Connector
        G04472818Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. After connecting the fuel tube connector, check that the fuel tube connector and pipe are securely connected by pulling them.
        Fig 9: Pulling Fuel Tube Connector
        G04472819Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Take the following precautions when removing the fuel tube connector (Type B).
      1. Check the fuel tube connector and pipe for dirt or mud before removing the fuel tube connector. If they are dirty, wipe them off with a shop rag.
      2. Pinch the retainer as illustrated, then pull out the fuel tube connector from the pipe.
        Fig 10: Precautions For Removing Fuel Tube Connector (Type B)
        G04472820Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. If the fuel connector and pipe are stuck, pinch the pipe, then push and pull the fuel tube connector to release and disconnect the fuel tube connector.
        NOTE: Do not use any tools.
      4. After removing the fuel tube, check the sealing surface of the pipe for dirt or mud.

        If it is dirty, wipe it off with a shop rag.

        Fig 11: Disconnecting Fuel Tube Connector
        G04472821Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. Cover the disconnected fuel tube connector and pipe with a plastic bag to prevent damage and intrusion of foreign objects.
        Fig 12: Covering Disconnected Fuel Tube Connector And Pipe Using Plastic Bag
        G04472822Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. Take the following precautions when installing the fuel tube connector (Type B).
      1. Align the fuel tube connector with the pipe, then push in the fuel tube connector until the retainer makes a "click" sound.

        HINT:

        If they are connected too tightly, apply a light coat of engine oil to the tip of the pipe, then install the fuel tube connector.

        Fig 13: Pushing In Fuel Tube Connector
        G04472823Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. After connecting the fuel tube connector, check that the fuel tube connector and pipe are securely connected by pulling them.
        Fig 14: Pulling Fuel Tube Connector
        G04472824Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. CHECK FOR FUEL LEAKS 
    1. Check that there are no fuel leaks after doing maintenance on the fuel system (see ON-VEHICLE INSPECTION ).
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