Fuel Pressure - Subaru 2004 Impreza Service Manual

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) Release the fuel pressure. <Ref. to FU(H4SO)-
50, 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.
5) Start the engine.
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)
Fuel Pressure
NOTE:
The fuel pressure gauge registers 10 to 20 kPa (0.1
to 0.2 kg/cm
ues during high-altitude operations.
ME-00198
FU-00262
2
,
2
,
ME(H4SO)-31
2
, 1 to 3 psi) higher than standard val-
MECHANICAL