LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2007 >> ES 350 >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> Fuel >> Fuel System >> Precaution
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Fuel System: Precaution

  1. PRECAUTION 
    1. Before inspecting and repairing the fuel system, disconnect the cable from the negative (-) battery terminal.
    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:
    • Perform the following procedures to prevent fuel from spilling out before removing any fuel system parts.
    • Pressure will still remain in the fuel line even after performing the following procedures. When disconnecting the fuel line, cover it with a shop rag or a piece of cloth to prevent fuel from spraying or coming out.
    1. Remove the rear seat cushion assembly.
    2. Remove the rear floor service hole cover.
    3. Disconnect the fuel pump connector.
    4. Start the engine.
    5. After the engine stops, turn the engine switch off.

      HINT:

      DTC P0171/25 (fuel problem) may be detected.

    6. Crank the engine again. Check that the engine does not start.
    7. Remove the fuel tank cap to discharge pressure from the fuel tank.
      Fig 1: Locating Fuel Pump Connector And Rear Floor Service Hole Cover
      G04974865Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. Disconnect the cable from the negative (-) battery terminal.
    9. Reconnect the fuel pump connector.
    10. Install the rear floor service hole cover.
    11. Install the rear seat.
  3. FUEL SYSTEM 
    1. When disconnecting the high pressure fuel line, a large amount of gasoline will spill out, so observe the following procedures:
      1. Discharge the fuel system pressure (step 2).
      2. Disconnect the fuel pump tube (See REMOVAL  ).
      3. Drain the fuel that remains in the fuel pump tube.
      4. To protect the disconnected fuel pump tube from damage and contamination, cover it with a plastic bag.
      5. Put a container under the connectors.
        Fig 2: Covering Fuel Pump Main Tube From Plastic Bag
        G04974866Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Observe the following precautions when removing and installing the fuel injectors:
      1. Never reuse an O-ring.
      2. When placing a new O-ring on the injector, do not damage the O-ring.
      3. Coat a new O-ring with spindle oil or gasoline before installing it.
        NOTE: Do not use engine oil, gear oil or brake fluid.
        Fig 3: Identifying Injector O-Ring
        G04974986Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Install the injector to the delivery pipe and the lower intake manifold as shown in the illustration.
      NOTE: Before installing the injector, be sure to apply appropriate lubricant or gasoline to the place where the delivery pipe or cylinder head contacts the injector O-rings.
      Fig 4: Holding Fuel Delivery Pipe To Intake Manifold
      G05138156Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Observe the following precautions when disconnecting the fuel tube connectors (Quick type A):
      1. Remove the No. 1 fuel pipe clamp.
      2. Check that there is no dirt or other foreign objects on the pipe and around the connector before disconnecting them. Clean them if necessary.
        Fig 5: Identifying Fuel Pipe Clamp
        G04974875Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Disconnect the connector from the pipe by hand.
      4. If the connector and the pipe are stuck, push in and pull on the connector to release it. Pull the connector out of the pipe carefully.
      5. Check that there is no dirt or other foreign objects on the sealing surface of the disconnected pipe. Clean the surfaces if necessary.
        Fig 6: Pushing Fuel Tube Connector (Quick Type A)
        G04974876Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      6. Do not damage the disconnected pipe or connector. Prevent entry of foreign objects by covering the connectors with plastic bags.
        Fig 7: Covering Pipe And Connector With Plastic Bag
        G04974877Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Observe the following precautions when connecting the fuel tube connectors (Quick Type A):
      1. Check if there is any damage or foreign objects on the connecting parts of the pipes.
      2. Line up the two parts of the pipes to be connected, and push them together until the connector makes a "click" sound. If the pipe is difficult to push into the connector, apply a small amount of clean engine oil to the tip of the pipe and reinsert it.
      3. After connecting the pipes, check that the pipe and connector are securely connected by pulling on them.
      4. Check for fuel leaks.
        Fig 8: Push Pipe Into Connector
        G04974878Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Observe the following precautions when disconnecting the fuel tube connector (Quick type B):
      1. Before disconnecting the connector, clean off any dirt that may be present.
      2. Pinch the tabs of the fuel tube retainer to disengage the 2 claws. Push the retainer down as shown in the illustration.

        HINT:

        Be sure to disconnect the connector by hand.

        Fig 9: Detaching Claws Of Connector Retainer
        G04974879Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. If the connector and pipe are stuck, hold the fuel pipe by hand, and push and pull on the connector. Pull the two pipes apart to separate the connector.
      4. Check if there is any dirt or any other foreign objects on the sealing surfaces of the disconnected pipes. Clean the sealing surfaces if necessary.
        Fig 10: Checking Sealing Surface Of Connector
        G04974880Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. Do not damage the disconnected pipe or connector. Prevent entry of foreign objects by covering the connectors with plastic bags.
        Fig 11: Covering Connector And Pipe With Plastic Bag (Quick Type B)
        G04974881Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. Observe the following precautions when connecting the fuel tube connector (Quick Type B):
      1. Line up the two parts of the pipes to be connected, and fully push the fuel tube connector and pipe together until they are fully seated. Next, push the retainer into the connector until its claws lock. If the pipe is difficult to push in to the connector, apply a small amount of clean engine oil to the tip of the pipe and reinsert it.
      2. After connecting the pipes, check that the pipe and connector are securely connected by pulling on them.
      3. Check for fuel leaks.
        Fig 12: Disconnecting Fuel Tube Connector (Quick Type B)
        G04974882Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. Observe the following precautions when handling a nylon tube:
      CAUTION:
      • Do not twist the connector part of the nylon tube or the quick connector when connecting them.
      • Do not bend or twist the nylon tube.
      • Do not remove the EPDM protector on the outside of the nylon tube.
      • Do not pinch or kink the nylon tubes to prevent fuel leakage.
  4. CHECK FOR FUEL LEAKS 
    1. Check that there are no fuel leaks from the fuel system after doing any maintenance or repairs (See ON-VEHICLE INSPECTION  ).
scientia non olet · About LEMON Manuals