Fuel Pressure - Subaru Legacy 2003 Service Manual

MECHANICAL

7. Fuel Pressure

A: INSPECTION
WARNING:
Before removing the fuel pressure gauge, lower
the fuel pressure.
NOTE:
If out of specification, check or replace the pressure
regulator and pressure regulator vacuum hose.
1) Lower the fuel pressure. <Ref. to FU(H4SO)-48,
RELEASING OF FUEL PRESSURE, OPERA-
TION, 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.
FUEL PRESSURE
5) Start the engine.
6) Measure the fuel pressure while disconnecting
the pressure regulator vacuum hose from intake
manifold.
Fuel pressure:
7) After connecting the pressure regulator vacuum
hose, measure the fuel pressure.
Fuel pressure:
ME-00641
NOTE:
The fuel pressure gauge registers 10 to 20 kPa (0.1
to 0.2 kg/cm
ues during high-altitude operations.
ME-00420
ME(H4SO)-28
Standard; 284 — 314 kPa (2.9 — 3.2 kg/cm
41 — 46 psi)
Standard; 206 — 235 kPa (2.1 — 2.4 kg/cm
30 — 34 psi)
2
, 1 to 3 psi) higher than standard val-
2
,
ME-00198
2
,
ME-00198