Impreza WRX F4-2.0L DOHC Turbo (2004)
Fuel Pressure: Testing and Inspection
Fuel Pressure
INSPECTION
WARNING: Before removing the fuel pressure gauge, release the fuel pressure.
NOTE: If out of specification, check or replace the pressure regulator and pressure regulator vacuum hose.
1) Release the fuel pressure.
2) Open the fuel flap lid, and remove the fuel filler cap.
3) Disconnect the fuel delivery hoses from fuel filter, and connect the fuel pressure gauge.
4) Connect the connector of fuel pump relay.
5) Start the engine.
6) Measure fuel pressure while disconnecting the pressure regulator vacuum hose from intake manifold.
Fuel pressure:
Standard: 284 - 314 kPa (2.9 - 3.2 kgf/cm2, 41 - 46 psi)
