Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 44
FU(STI)-88
Fuel Filter
FUEL INJECTION (FUEL SYSTEMS)
7) Replace the cushion on the rear face of the sub
tank with a new cushion.
8) Connect the pump assembly connector to the
sub tank bracket assembly.
9) Install the fuel level sensor. <Ref. to FU(STI)-82,
INSTALLATION, Fuel Level Sensor.>
10) Inspect the fuel level sensor. <Ref. to FU(STI)-
82, INSPECTION, Fuel Level Sensor.>
11) Install the fuel pump assembly. <Ref. to
FU(STI)-81, INSTALLATION, Fuel Pump.>
FU-03863
FU-03849
FU(STI)-89
Pulsation Damper Assembly
FUEL INJECTION (FUEL SYSTEMS)
31.Pulsation Damper Assembly
A: REMOVAL
WARNING:
Place “NO OPEN FLAMES” signs near the
working area.
CAUTION:
• Be careful not to spill fuel.
• Catch the fuel from hoses using a container
or cloth.
1) Release the fuel pressure. <Ref. to FU(STI)-67,
RELEASING OF FUEL PRESSURE, PROCE-
2) Disconnect the fuel delivery hose (A) and fuel
hose (B) from the pulsation damper assembly, and
remove the pulsation damper assembly.
B: INSTALLATION
Install in the reverse order of removal.
NOTE:
For the information about connecting the fuel deliv-
ery hose and fuel hose, refer to “Fuel Delivery, Re-
turn & Evaporation Lines”. <Ref. to FU(STI)-97,
CONNECTING FUEL DELIVERY HOSE, FUEL
RETURN HOSE AND FUEL HOSE, INSTALLA-
TION, Fuel Delivery, Return and Evaporation
C: DISASSEMBLY
Remove the pulsation damper and fuel pipe gasket
from the fuel by-pass pipe.
D: ASSEMBLY
Install the fuel pipe gasket and pulsation damper to
the fuel by-pass pipe.
NOTE:
Use a new fuel pipe gasket.
Tightening torque:
21.6 N·m (2.2 kgf-m, 15.9 ft-lb)
E: INSPECTION
1) Check that the pulsation damper assembly has
no deformation, cracks or other damages.
2) Check that the fuel delivery hose and fuel hose
have no cracks, damage or loose part.
FU-05794
(A)
(B)
(A)
(A) Fuel by-pass pipe
(B) Pulsation damper
(C) Fuel pipe gasket
(A) Fuel by-pass pipe
(B) Pulsation damper
(C) Fuel pipe gasket
FU-06743
(C)
(B)
(A)
FU-06744
(C)
(B)
(A)
FU(STI)-90
Pressure Regulator & Damper Assembly
FUEL INJECTION (FUEL SYSTEMS)
32.Pressure Regulator & Damp-
er Assembly
A: REMOVAL
WARNING:
Place “NO OPEN FLAMES” signs near the
working area.
CAUTION:
• Be careful not to spill fuel.
• Catch the fuel from hoses using a container
or cloth.
1) Release the fuel pressure. <Ref. to FU(STI)-67,
RELEASING OF FUEL PRESSURE, PROCE-
2) Disconnect the vacuum hose (A) from the pres-
sure regulator and damper assembly.
3) Disconnect the fuel return hose (B) and fuel
hose (C) from the pressure regulator & damper as-
sembly, and remove the fuel regulator & damper
assembly.
B: INSTALLATION
Install in the reverse order of removal.
NOTE:
For the information about connecting the fuel return
hose and fuel hose, refer to “Fuel Delivery, Return
& Evaporation Lines”. <Ref. to FU(STI)-97, CON-
NECTING FUEL DELIVERY HOSE, FUEL RE-
TURN HOSE AND FUEL HOSE, INSTALLATION,
Fuel Delivery, Return and Evaporation Lines.>
C: DISASSEMBLY
1) Remove the fuel pipe protector from the pres-
sure regulator and damper assembly.
2) Remove the pulsation damper and fuel pipe gas-
ket from the fuel holder assembly, and remove the
pressure regulator from the fuel holder assembly.
FU-05795
(A)
(C)
(B)
(B)
(A) Pressure regulator & damper ASSY
(B) Fuel pipe protector
(A) Fuel holder ASSY
(B) Pulsation damper
(C) Fuel pipe gasket
(D) Pressure regulator
(E) O-ring
FU-06745
(A)
(B)
(C)
(B)
(A)
(D)
(E)
FU-06746
FU(STI)-91
Pressure Regulator & Damper Assembly
FUEL INJECTION (FUEL SYSTEMS)
D: ASSEMBLY
1) Install the pressure regulator to the fuel holder
assembly, and install the fuel pipe gasket and pul-
sation damper to the fuel holder assembly.
NOTE:
• Use new O-rings and fuel pipe gaskets.
• Apply a thin coat of engine oil to the pressure
regulator installation hole of fuel holder assembly.
Tightening torque:
T1: 6.4 N·m (0.7 kgf-m, 4.7 ft-lb)
T2: 21.6 N·m (2.2 kgf-m, 15.9 ft-lb)
2) Install the fuel pipe protector to the pressure reg-
ulator and damper assembly.
E: INSPECTION
1) Check that the pressure regulator and damper
assembly has no deformation, cracks or other dam-
ages.
2) Check that the vacuum hose, fuel return hose
and fuel hose have no cracks, damage or loose
part.
(A) Fuel holder ASSY
(B) Pulsation damper
(C) Fuel pipe gasket
(D) Pressure regulator
(E) O-ring
(A) Pressure regulator & damper ASSY
(B) Fuel pipe protector
(C)
(B)
(A)
(D)
(E)
T1
T2
FU-06747
FU-06745
(A)
(B)
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