Fuel Pressure - Subaru Legacy 2004 Service Manual

7. Fuel Pressure

A: INSPECTION
WARNING:
Before removing the fuel pressure gauge, re-
lease fuel pressure.
NOTE:
When the fuel pressure is out of specification,
check or replace the pressure regulator and pres-
sure regulator vacuum hose.
1) Release the fuel pressure.
<Ref. to FU(H4SO 2.0)-38, RELEASING OF FUEL
PRESSURE, PROCEDURE, Fuel.>
2) Open the fuel filler flap lid, and remove the fuel
filler cap.
3) Disconnect the fuel delivery hose from fuel
damper, and connect a fuel pressure gauge.
4) Install the fuse of fuel pump to main fuse box.
5) Start the engine.
6) Measure the fuel pressure while disconnecting
pressure regulator vacuum hose from intake mani-
fold.
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)
NOTE:
The fuel pressure gauge registers 10 to 20 kPa (0.1
2
to 0.2 kg/cm , 1 to 3 psi) higher than standard val-
ues during high-altitude operations.
Fuel Pressure
ME-00814
2
,
2
,
ME(H4SO 2.0)-27
MECHANICAL