Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. 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-

DURE, Fuel.>

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

Lines.>

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-

DURE, Fuel.>

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)