Subaru Legacy IV (2008 year). Service manual - part 245

FU(H4DOTC)-83

Fuel Delivery, Return and Evaporation Lines

FUEL INJECTION (FUEL SYSTEMS)

C: INSPECTION

1) Make sure that there are no cracks on the fuel
pipes and fuel hoses.
2) Make sure the fuel pipe and fuel hose connec-
tions are tightened firmly.

FU(H4DOTC)-84

Fuel System Trouble in General

FUEL INJECTION (FUEL SYSTEMS)

35.Fuel System Trouble in General

A: INSPECTION

NOTE:
• When the vehicle is left unattended for an extended period of time, water may accumulate in the fuel tank.
Fill the fuel tank fully to prevent this.
• In snow-covered areas, mountainous areas, skiing areas, etc. where ambient temperatures drop to 0°C
(32°F) or less throughout the winter season, use a water removing agent in the fuel system to prevent freez-
ing fuel system and accumulating water.
• When water is accumulated in fuel filter, fill the water removing agent in the fuel tank.
• Before using water removing agent, follow the cautions noted on the bottle.

Trouble and possible cause

Corrective action

1. Insufficient fuel supply to injector

1)

Fuel pump does not operate.

 

Defective terminal contact

Inspect contact, especially ground, and tighten it 
securely.

 

Trouble in electromagnetic or electronic circuit parts

Replace the faulty parts.

2)

Decline of fuel pump function

Replace the fuel pump.

3)

Clogged fuel filter

Replace the fuel filter. Clean or replace the fuel tank if 
necessary.

4)

Clogged or bent fuel pipe or hose

Clean, correct or replace the fuel pipe or hose.

5)

Air is mixed in the fuel system.

Inspect or retighten each connection part.

6)

Clogged or bent air breather tube or pipe.

Clean, correct or replace the air breather tube or pipe.

7)

Damaged diaphragm of pressure regulator

Replace.

2. Leakage or blow out of fuel

1)

Loose joints of the fuel pipe

Retighten.

2)

Cracked fuel pipe, hose and fuel tank

Replace.

3)

Defective welding part on the fuel tank

Replace.

4)

Clogged or bent air breather tube or air vent tube

Clean, correct or replace the air breather tube or air vent 
tube.

3. Gasoline smell inside of compartment

1)

Loose joints at air breather tube, air vent tube and fuel filler 
pipe

Retighten.

2)

Defective gasket air tightness on the fuel saucer

Correct or replace the gasket.

3)

Inoperative fuel pump modulator or circuit

Replace.

4. Defective fuel meter indicator

1)

Defective operation of fuel level sensor

Replace.

2)

Defective operation of fuel meter

Replace.

5. Noise

1)

Large operation noise or vibration of fuel pump

Replace.

EC(H4DOTC)-2

General Description

EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)

1. General Description

A: COMPONENT

1. SECONDARY AIR PUMP

(1)

Secondary air pump

(4)

Secondary air pump cover

Tightening torque:N·m (kgf-m, ft-lb)

(2)

Clip

(5)

Harness stay

T1: 6.4 (0.7, 4.7)

(3)

Secondary air pump bracket

(6)

Secondary air pump harness

T2: 19 (1.9, 14.0)

EC-02422

(1)

(3)

(4)

(2)

T1

T1

T1

T2

T1

(6)

(5)

EC(H4DOTC)-3

General Description

EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)

2. SECONDARY AIR COMBINATION VALVE

B: CAUTION

• Wear appropriate work clothing, including a cap,
protective goggles and protective shoes when per-
forming any work.
• Remove contamination including dirt and corro-
sion before removal, installation or disassembly.
• Keep the disassembled parts in order and pro-
tect them from dust and dirt.
• Before removal, installation or disassembly, be
sure to clarify the failure. Avoid unnecessary re-
moval, installation, disassembly and replacement.
• Vehicle components are extremely hot after driv-
ing. Be wary of receiving burns from heated parts.
• Be sure to tighten fasteners including bolts and
nuts to the specified torque.
• Place shop jacks or rigid racks at the specified
points.
• Before disconnecting connectors of sensors or
units, be sure to disconnect the ground cable from
the battery.

(1)

Gasket

(7)

Air duct A

(11)

Gasket

(2)

Gasket

(8)

Air duct B

(3)

Gasket

(9)

Secondary air combination valve 
LH

Tightening torque:N·m (kgf-m, ft-lb)

(4)

Clamp

T1: 9 (0.9, 6.6)

(5)

Secondary air pipe RH

(10)

Secondary air pipe LH

T2: 19 (1.9, 14.0)

(6)

Secondary air combination valve 
RH

EC-02423

(3)

(1)

(2)

(6)

(4)

(4)

(4)

(4)

(9)

T2

T1

T1

T1

T1

a

a

(8)

(7)

(5)

T1

(10)

(11)