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HOMESERVICE MANUALSTOYOTA2009SIENNA XLE, FWDREPAIR AND DIAGNOSISENGINE PERFORMANCEFUEL DELIVERYENGINE FUEL SYSTEMFUEL SYSTEMPRECAUTION
2009 Toyota Sienna XLE, FWD

Fuel System: Precaution

2009 Toyota Sienna XLE, FWDSECTION 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 (*1) 
    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 circuit opening relay from the engine room relay block.
      2. Fig 1: Removing Circuit Opening Relay
      G05138153Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Start the engine.
    3. After the engine stops, turn the engine switch off.

      HINT:

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

    4. Crank the engine again. Check that the engine does not start.
    5. Remove the fuel tank cap to discharge pressure from the fuel tank.
    6. Disconnect the cable from the negative (-) battery terminal.
    7. Reinstall the circuit opening relay.
  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(*1).
      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. Fig 2: Covering Fuel Pump Main Tube With Plastic Bag
        G04974866Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. Put a container under the connectors.
    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.
RENDER: 1.0x

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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.