Fuel Pressure: Inspection

1. Remove the collector cover.
2. Release the fuel pressure. Refer to RELEASING OF FUEL PRESSURE .
3. Open the fuel filler lid and remove the fuel filler cap.
4. Disconnect the fuel delivery hose from fuel damper, and connect fuel pressure gauge.
   Fig 1: Connecting Fuel Pressure Gauge

   Courtesy of SUBARU OF AMERICA, INC.
5. Start the engine.
6. Check the fuel pressure while disconnecting pressure regulator vacuum hose from intake manifold.
   NOTE:

   • The fuel pressure gauge registers 10 to 20 kPa (0.1 to 0.2 kgf/cm² , 1 to 3 psi) higher than standard values during high-altitude operations.
   • If the fuel pressure is out of specification, check or replace the fuel pump, fuel line, pressure regulator and pressure regulator vacuum hose.

   Fuel pressure: 

   Standard 

   328 - 358 kPa (3.3 - 3.7 kgf/cm ²  , 48 - 52 psi) 

7. After connecting the vacuum hose to the pressure regulator, measure the fuel pressure again.
   NOTE:

   • The fuel pressure gauge registers 10 to 20 kPa (0.1 to 0.2 kgf/cm² , 1 to 3 psi) higher than standard values during high-altitude operations.
   • If the fuel pressure is out of specification, check or replace the fuel pump, fuel line, pressure regulator and pressure regulator vacuum hose.

   Fuel pressure: 

   Standard 

   274 - 304 kPa (2.8 - 3.1 kgf/cm ²  , 40 - 44 psi) 

8. After inspection, install the related parts in the reverse order of removal.

Tightening torque: 

1.25 N.m (0.1 kgf-m, 0.9 ft-lb)