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Fuel Pressure: Inspection

  1. Release the fuel pressure.

    Gasoline engine model: 

    Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO (EXCEPT FOR HEV))>FUEL>PROCEDURE>RELEASING OF FUEL PRESSURE .

    Hybrid model: 

    Ref. to FUEL INJECTION (FUEL SYSTEMS) (H4DO(HEV))>FUEL>PROCEDURE>RELEASING OF FUEL PRESSURE .

  2. Open the fuel filler lid and remove the fuel filler cap.
    NOTE: This operation is required to release the inner pressure of the fuel tank.
  3. Disconnect the fuel delivery tube from the fuel pipe assembly, and connect the fuel pressure gauge.
    CAUTION:
    • Be careful not to spill fuel.
    • Catch the fuel from the tubes using a container or cloth.
    1. Remove the fuel delivery tube clamp from the fuel delivery tube.
      • Gasoline engine model
        G11252920Courtesy of SUBARU OF AMERICA, INC.
      • Hybrid model
        G13229999Courtesy of SUBARU OF AMERICA, INC.
    2. Disconnect the quick connector on the fuel delivery tube from the fuel pipe assembly.
      NOTE: Disconnect the quick connector as shown in the figure.
      G13875908Courtesy of SUBARU OF AMERICA, INC.
      • Gasoline engine model
        G11252921Courtesy of SUBARU OF AMERICA, INC.
      • Hybrid model
        G13230002Courtesy of SUBARU OF AMERICA, INC.
    3. Connect the fuel pressure gauge with ST1 and ST2.
      CAUTION:
      • Check that there is no damage or dust on the quick connector. If necessary, clean the seal surface of the pipe.
      • When connecting the quick connector with slider, make sure to insert it all the way in before locking the slider.
      • When it is difficult to lock the slider, check that the connector is fully inserted.
      • After locking the slider, pull the quick connector body in the removal direction and then push it in the connecting direction, in order to check that the quick connector is securely connected. Always make sure to perform this confirmation ending up with a pushing in.
      NOTE:
      • ST1 is a SUBARU genuine part.
      • When connecting the ST2 to the quick connector on the fuel delivery tube, connect it as shown in the figure.
      G13875911Courtesy of SUBARU OF AMERICA, INC.

      Preparation tool: 

      ST1: FUEL HOSE (42075AG690)

      ST2: FUEL PIPE ADAPTER (18471AA000)

      G13875912Courtesy of SUBARU OF AMERICA, INC.
  4. Navigate to the service mode (for exhaust gas measurement). (Hybrid model) Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>WORK SUPPORT>OPERATION>SERVICE MODE .
    NOTE: If it is necessary to run the engine for 10 minutes or more, fasten the driver's seat belt.
  5. Start the engine.
  6. Check the fuel pressure after warming up the engine.
    NOTE:
    • The fuel pressure gauge readings becomes 10 - 20 kPa (0.1 - 0.2 kg/cm2 , 1 - 3 psi) higher than standard values during high-altitude operations.
    • Check or replace the fuel pump and fuel delivery line if the fuel pressure is out of the standard.

    Fuel pressure: 

    Standard 

    350 - 450 kPa (3.5 - 4.6 kg/cm2 , 50 - 66 psi)

  7. After inspection, install the related parts in the reverse order of removal.
    CAUTION:
    • Before removing the fuel pressure gauge, release the fuel pressure.
    • Be careful not to spill fuel.
    • Catch the fuel from hoses and tubes using a container or cloth.
    • Check that there is no damage or dust on the quick connector. If necessary, clean the seal surface of the pipe.
    • When connecting the quick connector with slider, make sure to insert it all the way in before locking the slider.
    • When it is difficult to lock the slider, check that the connector is fully inserted.
    • After locking the slider, pull the quick connector body in the removal direction and then push it in the connecting direction, in order to check that the quick connector is securely connected. Always make sure to perform this confirmation ending up with a pushing in.
    NOTE:
    • When disconnecting the ST1, install the ST2 to the fuel pipe assembly, and press the ST2 in the direction of arrow to disconnect the quick connector on the ST1.

    Preparation tool: 

    ST2: QUICK CONNECTOR RELEASE (42099AE000)

    • Gasoline engine model 
      G11252922Courtesy of SUBARU OF AMERICA, INC.
    • Hybrid model 
      G13230006Courtesy of SUBARU OF AMERICA, INC.
    • Disconnect the quick connector on the fuel delivery tube as shown in the figure  .
      G13875915Courtesy of SUBARU OF AMERICA, INC.
    • Connect the quick connector on the fuel delivery tube as shown in the figure  .
      G13875916Courtesy of SUBARU OF AMERICA, INC.
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