Fuel Pressure - Subaru 2002 IMPREZA Service Manual

MECHANICAL
FUEL PRESSURE
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(D0HC
0 P E RATION, Fuel. >
2) Open the fuel flap lid, and remove the fuel filler
cap.
TURBO)-51, RELEASING OF FUEL PRESSURE,
3) Disconnect the fuel delivery hoses from fuel fil-
ter, and connect the fuel pressure gauge.
4) Connect the connector of fuel pump relay.
44
I
5) Start the engine.
6) Measure fuel pressure while disconnecting the
pressure regulator vacuum hose from intake man-
ifold.
Fuel pressure:
Standard; 284
-
314 kPa (2.9
-
3.2 kgf/cd,
41
-
46 psi)
7)
Iter connecting the pressure regulator vacuum
hose, measure fuel pressure.
Fuel pressure:
Standard; 230
-
260 kPa (2.35
-
2.65 kgf/
cm', 33
-
38 psi)
I
NOTE:
The fuel pressure gauge registers 10 to 20 kPa (0.1
to 0.2 kgf/cm2, 1 to 3 psi) higher than standard Val-
ues during high-altitude operations.
ME(D0HC TU RB0)-27