Subaru Impreza 2003 Service Manual page 1013

7. Fuel Pressure
A: INSPECTION
CAUTION:
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
FU(H4DOTC)-53, RELEASING OF FUEL PRES-
SURE, OPERATION, Fuel.>
2) Open the fuel flap lid, and then remove the fuel
filler cap.
3) Disconnect the fuel delivery hoses from fuel fil-
ter, and then connect the fuel pressure gauge.
4) Connect the connector of fuel pump relay.
5) Start the engine.
FUEL PRESSURE
pressure. <Ref. to
ME-00010
FU-00871
ME(H4DOTC)-39
6) Measure the fuel pressure while disconnecting
the pressure regulator vacuum hose from intake
manifold.
Fuel pressure:
Standard; 284 — 314 kPa (2.9 — 3.2 kgf/cm
41 — 46 psi)
7) After connecting the pressure regulator vacuum
hose, measure the fuel pressure.
Fuel pressure:
Standard; 230 — 260 kPa (2.35 — 2.65
2
kgf/cm , 33 — 38 psi)
NOTE:
The fuel pressure gauge registers 10 to 20 kPa (0.1
2
to 0.2 kgf/cm , 1 to 3 psi) higher than standard val-
ues during high-altitude operations.
MECHANICAL
2
,
ME-00011
ME-00011