Fuel Pressure - Subaru Impreza 2002 Service Manual

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-54, RE-
LEASING OF FUEL PRESSURE, OPERATION,
Fuel.> or <Ref. to FU(w/oOBD)-51, RELEASING
OF FUEL PRESSURE, OPERATION, Fuel.>
2) Open the fuel flap lid, and then remove the fuel
filler cap.
3) Disconnect the fuel delivery hoses from fuel
damper, and then connect the fuel pressure gauge.
4) Connect the connector of fuel pump relay.
5) Start the engine.
FUEL PRESSURE
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 kg/cm
41 — 46 psi)
7) After connecting the pressure regulator vacuum
hose, measure the fuel pressure.
Fuel pressure:
Standard; 206 — 235 kPa (2.1 — 2.4 kg/cm
30 — 34 psi)
H2M2535
NOTE:
The fuel pressure gauge registers 10 to 20 kPa (0.1
to 0.2 kg/cm
ues during high-altitude operations.
S2M0195
EN0344
ME-29
2
, 1 to 3 psi) higher than standard val-
MECHANICAL
2
,
S2M0554
2
,
S2M0554