Impreza Sedan AWD F4-1820cc 1.8L SOHC (1993)
Fuel Pressure: Testing and Inspection
MEASUREMENT OF FUEL PRESSURE
1. Release fuel pressure.
2. Connect connector to fuel tank.
3. Disconnect fuel delivery hose from fuel filter, and connect fuel pressure gauge.
4. Start the engine.
5. Measure fuel pressure while disconnecting pressure regulator vacuum hose from collector chamber.
Fuel pressure:
235 - 265 kPa (2.4 - 2.7 kg/sq.cm, 34 - 38 psi)
6. After connecting pressure regulator vacuum hose, measure fuel pressure.
Fuel pressure:
177 - 206 kPa (1.8 - 2.1 kg/sq.cm, 26 - 30 psi)
WARNING: Before removing fuel pressure gauge, release fuel pressure.
NOTE: If out of specification as measured at step 6), check or replace pressure regulator and pressure regulator vacuum hose.