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Fuel pressure check (low-pressure side)
1. Fuel pressure gauge installation (port injection side)
  1. Perform the fuel spill prevention procedure. (Refer to Fuel system (FA20) )
    CAUTION: Since a small amount of residue pressure exists in the fuel line after the fuel spill prevention procedure, prevent the fuel from splashing when disconnecting the fuel line.
  2. Disconnect the fuel hose NO. 1 with the SST.
    SST 42099AE000
    
    Fig 1: Locating Fuel Hose No. 1
    Courtesy of SUBARU OF AMERICA, INC.
  3. Install the fuel pressure gauge to the vehicle.
  4. Wipe off any spilt fuel.
2. Fuel pressure gauge installation (cylinder injection side)
  1. Perform the fuel spill prevention procedure. (Refer to Fuel system (FA20) )
    CAUTION: Since a small amount of residue pressure exists in the fuel line after the fuel spill prevention procedure, prevent the fuel from splashing when disconnecting the fuel line.
  2. Disconnect the fuel hose NO. 2 with the SST.
    SST 42099AE000
    
    Fig 2: Locating Fuel Hose No. 2
    Courtesy of SUBARU OF AMERICA, INC.
  3. Install the fuel pressure gauge to the vehicle.
  4. Wipe off any spilt gasoline.
3. Fuel pressure check
  1. Measure the fuel pressure while engine idling after warming up the engine.
    Standard value: 350 to 500 kPa {4.0 to 5.0 kgf/cm² } {51 to 72 psi}
4. Perform the fuel spill prevention procedure. (Refer to Fuel system (FA20) )
5. Fuel pressure gauge removal
1. Be careful not to splash gasoline and remove the fuel pressure gauge.
2. Connect the fuel hoses NO. 1 and NO. 2.
Fuel pressure check (high pressure side)
1. Connect the SSM4 to the DLC.
2. Turn the ignition switch to ON.
3. Start the engine and check the value in 'Data monitor'→'Fuel pressure' at idling.
  Standard value: 3.5 to 4.5 MPa {35.7 to 45.9 kgf/cm² } {507.5 to 652.5 psi}
D-4S inspection (power balance) active test
1. Connect the SSM4 to the DLC.
2. Start the engine, select 'active test'→'D-4S (power balance)' according to the screen display, and select 'port' or 'cylinder'.
3. Check the idle state after the injection to the executed cylinder of [#1 to #4] is stopped. Criteria: The idle speed shall vary.
  CAUTION: Only one cylinder can be tested at a time and multiple cylinders shall not be tested.
Fuel leakage check
1. Make sure that there are no fuel leakages from the fuel system with the fuel pressure.

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.

Safety Warning

Function inspection

Use the Manual With the Right Hardware

When to See a Mechanic

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