Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual - part 42

FU(STI)-80

Fuel Pump

FUEL INJECTION (FUEL SYSTEMS)

27.Fuel Pump

A: REMOVAL

WARNING:

Place  “NO  OPEN  FLAMES”  signs  near  the

working area.
CAUTION:

• Be careful not to spill fuel.

• Catch the fuel from the tubes using a contain-

er or cloth.

• If the fuel gauge indicates that two thirds or

more of the fuel is remaining, be sure to drain

fuel  before  starting  work  to  avoid  the  fuel  to

spill.
NOTE:

Fuel pump assembly consists of fuel pump, fuel fil-

ter and fuel level sensor.

1) Release the fuel pressure. <Ref. to FU(STI)-67,

RELEASING  OF  FUEL  PRESSURE,  PROCE-

DURE, Fuel.>

2) Drain  fuel.  <Ref.  to  FU(STI)-67,  DRAINING

FUEL  (WITH  SUBARU  SELECT  MONITOR),

PROCEDURE, Fuel.>

3) Disconnect the ground cable from battery.

4) Remove the rear seat cushion. <Ref. to SE-13,

REMOVAL, Rear Seat.>

5) Remove the service hole cover.

(1) Remove the screws (A).

(2) Push  the  grommet  (B)  down  and  remove

service hole cover.

6) Disconnect the connector from fuel pump.

7) Disconnect the quick connectors of fuel delivery

tube (A), fuel return tube (B), and jet pump tube (C).

<Ref.  to  FU(STI)-93,  REMOVAL,  Fuel  Delivery,

Return and Evaporation Lines.>

8) Remove the nuts which hold the fuel pump up-

per plate to the fuel tank.

9) Remove the fuel pump assembly from the fuel

tank.

IN-00203

FU-06557

(A)

(B)

(A)

FU-03363

FU-04246

(B)

(C)

(A)

FU-04534

FU(STI)-81

Fuel Pump

FUEL INJECTION (FUEL SYSTEMS)

B: INSTALLATION

Install in the reverse order of removal while being

careful of the following.

• Make sure the sealing portion is free from fuel or

foreign matter before installation.

• Align protrusion (A) of the gasket to the position

shown in the figure.

• Insert  the  protrusion  (B)  of  gasket  to  the  fuel

pump upper plate. (3 places)

• Align the protrusion (C) of fuel pump assembly

with the cutout on the fuel pump upper plate.

• Tighten the nuts to the specified torque in the or-

der as shown in the figure.
NOTE:

Use a new gasket.
Tightening torque:

4.4 N·m (0.4 kgf-m, 3.2 ft-lb)

C: INSPECTION

1) Check  that  the  fuel  pump  has  no  deformation,

cracks or other damages.

2) Connect the battery positive terminal to terminal

No. 5 and the battery ground terminal to terminal

No. 6, and inspect the fuel pump operation.
WARNING:

• Wipe off fuel completely.

• Keep the battery as far apart from fuel pump

as possible.

• Do not run the fuel pump for a long time un-

der non-load condition.

(a) Front side of vehicle

FU-04532

1

2

3

4

5

6

7

8

(C)

(B)

(B)

(B)

(A)

(a)

FU-04110

2 1
4 3
6 5

FU(STI)-82

Fuel Level Sensor

FUEL INJECTION (FUEL SYSTEMS)

28.Fuel Level Sensor

A: REMOVAL

WARNING:

Place  “NO  OPEN  FLAMES”  signs  near  the

working area.
CAUTION:

• Be careful not to spill fuel.

• If the fuel gauge indicates that two thirds or

more of the fuel is remaining, be sure to drain

fuel  before  starting  work  to  avoid  the  fuel  to

spill.
NOTE:

The fuel level sensor is built in fuel pump assembly.

1) Remove  the  fuel  pump  assembly.  <Ref.  to

FU(STI)-80, REMOVAL, Fuel Pump.>

2) Disconnect the fuel level sensor connector.

3) Slide the fuel level sensor in the direction of the

arrow and remove the fuel level sensor by pressing

the claw (A) of the fuel level sensor.

B: INSTALLATION

Install in the reverse order of removal.

C: INSPECTION

1) Check that the fuel level sensor has no damage.

2) Measure the fuel level sensor float position.
NOTE:

When inspecting the fuel level sensor, perform the

work with the sensor installed to the fuel pump.

3) Measure the resistance between fuel level sen-

sor terminals.

FU-04223

FU-04224

(A)

(1) FULL
(2) EMPTY
(3) Fuel tank seating surface

Float position

Standard

FULL to Fuel tank seating 

surface (A)

135±4 mm (5.315±0.157 in)

EMPTY to Fuel tank seating 

surface (B)

23.7±4 mm (0.933±0.157 in)

Float position

Terminal No.

Standard

FULL (A)

1 and 4

2.0±1.0 Ω

EMPTY (B)

31.9±1.0 Ω

FU-04229

(1)

(A)

(3)

(B)

(2)

FU-04230

2 1
4 3
6 5

(B)

(A)

FU(STI)-83

Fuel Sub Level Sensor

FUEL INJECTION (FUEL SYSTEMS)

29.Fuel Sub Level Sensor

A: REMOVAL

WARNING:

Place  “NO  OPEN  FLAMES”  signs  near  the

working area.
CAUTION:

• Be careful not to spill fuel.

• Catch the fuel from the tubes using a contain-

er or cloth.

• If the fuel gauge indicates that two thirds or

more of the fuel is remaining, be sure to drain

fuel  before  starting  work  to  avoid  the  fuel  to

spill.

1) Release the fuel pressure. <Ref. to FU(STI)-67,

RELEASING  OF  FUEL  PRESSURE,  PROCE-

DURE, Fuel.>

2) Drain  fuel.  <Ref.  to  FU(STI)-67,  DRAINING

FUEL  (WITH  SUBARU  SELECT  MONITOR),

PROCEDURE, Fuel.>

3) Disconnect the ground cable from battery.

4) Remove the rear seat cushion. <Ref. to SE-13,

REMOVAL, Rear Seat.>

5) Remove the service hole cover.

6) Disconnect the connector from the fuel sub level

sensor.

7) Disconnect the quick connectors of fuel delivery

tube (A), fuel return tube (B), and jet pump tube (C).

<Ref.  to  FU(STI)-93,  REMOVAL,  Fuel  Delivery,

Return and Evaporation Lines.>

8) Remove the rubber cap (D) from the nut.

9) Remove the bolts and nuts which hold fuel sub

level sensor protector and fuel sub level sensor up-

per plate to the fuel tank.

10) Remove the fuel sub level sensor from the fuel

tank.

IN-00203

FU-06553

FU-03364

FU-04239

(A)

(B)

(C)

(D)

FU-01146

FU-04569