Fuel Pressure - Subaru IMPREZA 2002 Service Manual

FUEL PRESSURE
MECHANICAL
7. Fuel Pressure
A: INSPECTION
WARNING:
Before removing the fuel pressure gauge, re-
lease the fuel pressure.
NOTE:
If out of specification, check or replace the pressure
regulator and pressure regulator vacuum hose.
1) Release the fuel pressure. <Ref. to FU(S0HC)-
TION, Fuel.>
2) Open the fuel flap lid, and remove the fuel filler
cap.
50, RELEASING OF FUEL PRESSURE, OPERA-
3) Disconnect the fuel delivery hoses from fuel fil-
ter, and connect the fuel pressure gauge.
~
4) Connect the connector of fuel pump relay.
6) Measure fuel pressure while disconnecting the
pressure regulator vacuum hose from intake man-
ifold.
Fuel pressure:
Standard; 284
-
314 kPa (2.9
-
3.2 kgf/cn?,
41
-
46 psi)
7) After connecting the pressure regulator vacuum
hose, measure fuel pressure.
Fuel pressure:
Standard; 206
-
235 kPa (2.1
-
2.4 kgvcn?,
30
-
34 psi)
NOTE:
The fuel pressure gauge registers 10 to 20 kPa (0.1
to 0.2 kgf/cm2, 1 to 3 psi) higher than standard Val-
ues during high-altitude operations.
5) Start the engine.
ME(S0HC)-28