Subaru Legacy III (2000-2003 year). Manual - part 248

 

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Subaru Legacy III (2000-2003 year). Manual - part 248

 

 

FU(H6DO)-76

FUEL INJECTION (FUEL SYSTEMS)

FUEL SYSTEM TROUBLE IN GENERAL

31.Fuel System Trouble in General

A: INSPECTION

NOTE:
• When the vehicle is left unattended for an ex-
tended period of time, water may accumulate in the
fuel tank.
To prevent water condensation.

(1) Top off the fuel tank or drain the fuel com-
pletely.
(2) Drain water condensation from the fuel filter.

• Refilling the fuel tank.
Refill the fuel tank while there is still some fuel left in
the tank.
• Protecting the fuel system against freezing and
water condensation.

(1) Cold areas
In snow-covered areas, mountainous areas, ski-
ing areas, etc. where ambient temperatures
drop below 0

°

C (32

°

F) throughout the winter

season, use an anti-freeze solution in the cool-
ing system. Refueling will also complement the
effect of anti-freeze solution each time the fuel
level drops to about one-half. After the winter

season, drain water which may have accumulat-
ed in the fuel filter and fuel tank in the manner
same as that described under Affected areas
below.
(2) Affected areas
When water condensation is notched in the fuel
filter, drain water from both the fuel filter and fuel
tank or use a water removing agent (or anti-
freeze solution) in the fuel tank.

• Observe the instructions, notes, etc., indicated
on the label affixed to the anti-freeze solution (wa-
ter removing agent) container before use.

Trouble and possible cause

Corrective action

1. Insufficient fuel supply to the injector

1)

Fuel pump will not operate.

Defective terminal contact.

Inspect connections, especially ground, and tighten 
securely.

Trouble in electromagnetic or electronic circuit parts.

Replace the fuel pump.

2)

Lowering of fuel pump function.

Replace the fuel pump.

3)

Clogged dust or water in the fuel filter.

Replace the fuel filter, clean or replace the fuel tank.

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 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 fuel

1)

Loosened joints of the fuel pipe.

Retightening.

2)

Cracked fuel pipe, hose and fuel tank.

Replace.

3)

Defective welding part on the fuel tank.

Replace.

4)

Defective drain packing of the fuel tank.

Replace.

5)

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.

Retightening.

2)

Defective packing air tightness on the fuel saucer.

Correct or replace packing.

3)

Cracked fuel separator.

Replace the separator.

4)

Inoperative fuel pump modulator or circuit.

Replace.

4. Defective fuel meter indicator

1)

Defective operation of fuel meter unit.

Replace.

2)

Defective operation of fuel meter.

Replace.

5. Noise

1)

Large operation noise or vibration of fuel pump.

Replace.

EC(H6DO)-2

EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)

GENERAL DESCRIPTION

1. General Description

A: CAUTION

• Wear working clothing, including a cap, protec-
tive goggles, and protective shoes during opera-
tion.
• Remove contamination including dirt and corro-
sion before removal, installation or disassembly.
• Keep the disassembled parts in order and pro-
tect them from dust or dirt.
• Before removal, installation or disassembly, be
sure to clarify the failure. Avoid unnecessary re-
moval, installation, disassembly, and replacement.
• Be careful not to burn your hands, because each
part on the vehicle is hot after running.
• Be sure to tighten fasteners including bolts and
nuts to the specified torque.
• Place shop jacks or safety stands at the specified
points.
• Before disconnecting electrical connectors of
sensors or units, be sure to disconnect ground ca-
ble from battery.

EC(H6DO)-3

EMISSION CONTROL (AUX. EMISSION CONTROL DEVICES)

FRONT CATALYTIC CONVERTER

2. Front Catalytic Converter

A: REMOVAL

1) Set the vehicle on the lift.
2) Remove battery.
3) Remove air cleaner case and air intake duct.
<Ref. to IN(H6DO)-5, REMOVAL, Air Cleaner.>
and <Ref. to IN(H6DO)-7, REMOVAL, Air Intake
Duct.>
4) Disconnect front oxygen (A/F) sensor connec-
tors.

5) Lift-up the vehicle.
6) Remove under cover.
7) Remove front oxygen (A/F) sensor harness from
the clips attached to both right and left cylinder
head covers.
8) Disconnect connector from rear oxygen sensor
connector.

9) Separate front exhaust pipe from rear exhaust
pipe.

CAUTION:
Be careful, exhaust pipe is hot.

10) Remove nuts which hold front exhaust pipe
onto cylinder heads.

11) Remove front exhaust pipe from hanger brack-
et.

CAUTION:
Be careful not to pull down front exhaust pipe.

EX-00056

LH side

RH side

EX-00058

EX-00059

EX-00060

RH side

LH side

EX-00061

 

 

 

 

 

 

 

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