Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 134

FU(w/o STI)-63

Electronic Throttle Control Relay

FUEL INJECTION (FUEL SYSTEMS)

3) Connect battery positive terminal to terminal No.

3 and battery ground terminal to terminal No. 4, and

measure the resistance between the electronic

throttle control relay terminals.

Terminal No.

Standard

1 and 2

Less than 1 Ω

FU-04077

1
2

3 4

(1)

(2)

(1)

(4)

(2)

(3)

(3)

(4)

FU(w/o STI)-64

Fuel Pump Control Unit

FUEL INJECTION (FUEL SYSTEMS)

22.Fuel Pump Control Unit

A: REMOVAL

1) Disconnect the ground cable from battery.

2) Remove the right side trunk side trim. (4 door

model) <Ref. to EI-63, REMOVAL, Trunk Room

Trim.>

3) Remove the right side rear quarter trim. (5 door

model) <Ref. to EI-60, REMOVAL, Rear Quarter

Trim.>

4) Disconnect the connector (A) from the fuel pump

control unit, and remove the fuel pump control unit.

• 4 door model

• 5 door model

B: INSTALLATION

Install in the reverse order of removal.
Tightening torque:

5 N·m (0.5 kgf-m, 3.7 ft-lb)

C: INSPECTION

Check that the fuel pump control unit has no defor-

mation, cracks or other damages.

IN-00203

FU-05753

(A)

FU-05754

(A)

FU(w/o STI)-65

Fuel

FUEL INJECTION (FUEL SYSTEMS)

23.Fuel

A: PROCEDURE

1. RELEASING OF FUEL PRESSURE

WARNING:

Place “NO OPEN FLAMES” signs near the

working area.
CAUTION:

Be careful not to spill fuel.

1) Remove the fuse of fuel pump from main fuse

box.

2) Start the engine and run it until it stalls.

3) After the engine stalls, crank it for five more sec-

onds.

4) Turn the ignition switch to OFF.

5) Install the fuse of fuel pump to the main fuse box.

2. DRAINING FUEL (WITH SUBARU SE-

LECT MONITOR)

WARNING:

Place “NO OPEN FLAMES” signs near the

working area.
CAUTION:

Be careful not to spill fuel.
NOTE:

• If the fuel pump cannot be driven, refer to the

procedures for draining from the fuel filler hose.

<Ref. to FU(w/o STI)-66, DRAINING FUEL

(THROUGH THE FUEL FILLER HOSE), PROCE-

DURE, Fuel.>

• Be careful not to let the battery run-out.

• Be aware that the fuel may remain in the fuel

tank after draining the fuel.

1) Release the fuel pressure. <Ref. to FU(w/o STI)-

65, RELEASING OF FUEL PRESSURE, PROCE-

DURE, Fuel.>

2) Attach ST to the fuel delivery pipe and push ST

in the direction of arrow mark to disconnect the fuel

delivery hose.

ST 42099AE000 QUICK CONNECTOR RE-

LEASE

CAUTION:

• Be careful not to spill fuel.

• Catch the fuel from hoses using a container

or cloth.

3) Connect ST to the fuel delivery hose.

ST 18471AA000 FUEL PIPE ADAPTER

4) Connect the gasoline proof hose to ST and put

the end of the hose in the container.

5) Drive the fuel pump and drain the fuel using Sub-

aru Select Monitor. <Ref. to EN(H4DOTC)(diag)-

65, FUEL PUMP CONTROL (ON/OFF DRIVE),

OPERATION, System Operation Check Mode.>
CAUTION:

Be careful not to spill fuel.

6) Install the related parts in the reverse order after

draining the fuel.

FU-01122

(A) Fuel delivery hose
(B) Fuel return hose

(C) Evaporation hose

ME-04968

(B) (C)

(A)

ST

FU(w/o STI)-66

Fuel

FUEL INJECTION (FUEL SYSTEMS)

3. DRAINING FUEL (THROUGH THE FUEL

FILLER HOSE)

• 4 door model
WARNING:

Place “NO OPEN FLAMES” signs near the

working area.
CAUTION:

• Be careful not to spill fuel.

• Fuel may remain in the fuel filler pipe. Drain

the fuel from the fuel filler pipe through the fill

opening using the gasoline proof pump and the

gasoline proof hose (ø10 or less) before the op-

eration.
NOTE:

Be aware that the fuel may remain in the fuel tank

after draining the fuel.

1) Lift up the vehicle.

2) Remove the rear exhaust pipe and muffler.

<Ref. to EX(STI)-13, REMOVAL, Rear Exhaust

Pipe.> <Ref. to EX(STI)-15, REMOVAL, Muffler.>

3) Remove the rear sub frame. <Ref. to RS-17, RE-

MOVAL, Rear Sub Frame.>

4) Open the fuel filler lid and remove the fuel filler

cap.

5) Drain the fuel from the fuel filler pipe through the

filler opening using the gasoline proof pump and

the gasoline proof hose (ø10 or less).

6) Disconnect the fuel filler hose from the fuel filler

pipe assembly.
CAUTION:

• Be careful not to spill fuel.

• Catch the fuel from hoses using a container

or cloth.

7) Set the container under the vehicle and insert

the gasoline proof hose (ø10 or less) into the fuel

filler hose to drain the fuel.
CAUTION:

Be careful not to spill fuel.

8) Install the related parts in the reverse order after

draining the fuel.
NOTE:

Correctly insert the fuel filler hose to the spool, and

then install the clamp as shown.
Tightening torque:

2.5 N·m (0.3 kgf-m, 1.8 ft-lb)

• 5 door model
WARNING:

Place “NO OPEN FLAMES” signs near the

working area.
CAUTION:

• Be careful not to spill fuel.

• Fuel may remain in the fuel filler pipe. Drain

the fuel from the fuel filler pipe through the fill

opening using the gasoline proof pump and the

gasoline proof hose (ø10 or less) before the op-

eration.
NOTE:

Be aware that the fuel may remain in the fuel tank

after draining the fuel.

1) Lift up the vehicle.

2) Remove the rear exhaust pipe and muffler.

<Ref. to EX(STI)-13, REMOVAL, Rear Exhaust

Pipe.> <Ref. to EX(STI)-15, REMOVAL, Muffler.>

3) Open the fuel filler lid and remove the fuel filler

cap.

4) Drain the fuel from the fuel filler pipe through the

filler opening using the gasoline proof pump and

the gasoline proof hose (ø10 or less).

FU-05836

(1) Fuel filler hose
(2) Clamp
(3) Spool
(4) Fuel filler pipe

FU-05815

(1)

(2)

(4)

L

L/2

(3)