2004 SUBARU FORESTER fuel filter

FU(H4DOTC 2.5)-2
FUEL INJECTION (FUEL SYSTEM)
General Description
1. General Description
A: SPECIFICATION
Fuel tankCapacity 602 (15.9 US gal, 13.2 Imp gal)
Location Under rear seat
Fuel pumpType Impeller
Shutoff discharge pressure
450 — 677 kPa (4.59 — 6.9 kg/cm
2, 65.27 — 98.2 psi)
Discharge flowMore than 1302 (34.3 US gal, 28.6 Imp gal)/h
[12 V at 300 kPa (3.06 kg/cm
2, 43.5 psi)]
Fuel filterCartridge type

FU(H4DOTC 2.5)-8
FUEL INJECTION (FUEL SYSTEM)
General Description
(1) Heat shield cover (13) Evaporation hose B (25) Evaporation hose E
(2) Fuel tank band (14) Joint pipe (26) Fuel sub level sensor gasket
(3) Protector LH (15) Evaporation hose C (27) Jet pump filter
(4) Protector RH (16) Evaporation pipe ASSY (28) Fuel sub level sensor
(5) Fuel tank (17) Evaporation pipe (29) Evaporation hose F
(6) Fuel pump gasket (18) Fuel return hose A (30) Evaporation hose G
(7) Fuel pump ASSY (19) Jet pump hose
(8) Fuel level sensor (20) RetainerTightening torque: N·m (kgf-m, ft-lb)
(9) Fuel cut valve gasket (21) Quick connectorT1: 4.4 (0.45, 3.3)
(10) Fuel cut valve (22) Evaporation hose DT2: 7.4 (0.75, 5.4)
(11) Evaporation hose A (23) Fuel pipe ASSYT3: 33 (3.4, 24.3)
(12) Clip (24) Fuel return hose B

FU(H4DOTC 2.5)-10
FUEL INJECTION (FUEL SYSTEM)
General Description
(1) Clip (11) Fuel pipe ASSY (21) Two-way valve drain hose A
(2) Fuel delivery hose A (12) Grommet (22) Connector
(3) Fuel filter bracket (13) Canister hose A (23) Two-way valve drain hose B
(4) Fuel filter holder (14) Canister (24) Clamp
(5) Fuel filter cup (15) Canister bracket plate (25) Front canister bracket
(6) Fuel filter (16) Cushion
(7) Evaporation hose (17) Canister bracket spacerTightening torque: N·m (kgf-m, ft-lb)
(8) Fuel damper (18) Rear canister bracketT: 23 (2.3, 17.0)
(9) Fuel deliver y hose B (19) Two-way valve return hose
(10) Fuel return hose (20) Two-way valve

FU(H4DOTC 2.5)-57
FUEL INJECTION (FUEL SYSTEM)
Fuel Filter
27.Fuel Filter
A: REMOVAL
WARNING:
 Place “NO FIRE” signs near the working area.
 Be careful not to spill fuel on the floor.
1) Release the fuel pressure.
FUEL PRESSURE, OPERATION, Fuel.>
2) Disconnect the fuel delivery hoses from fuel filter.
3) Remove the filter from holder.
B: INSTALLATION
CAUTION:
 If fuel hoses are damaged at the connecting
portion, replace it with a new one.
 If clamps are badly damaged, replace with new
ones.
1) Install in the reverse order of removal.
2) Tighten the hose clamp screws.
Tightening torque:
1.25 N·m (0.13 kgf-m, 0.94 ft-lb)
C: INSPECTION
1) Check the inside of fuel filter for dirt and water
sediment.
2) If it is clogged, or if replacement interval has
been reached, replace it.
3) If water is found in it, shake and expel the water
from inlet port.
FU-00118
FU-00118

FU(H4DOTC 2.5)-63
FUEL INJECTION (FUEL SYSTEM)
Fuel System Trouble in General
31.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.
To prevent water condensation.
(1) Top off the fuel tank or drain the fuel completely.
(2) Drain the 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.
(3) Cold areas:
In snow-covered areas, mountainous areas, skiing areas, etc. where ambient temperatures drop below
0°C (32°F) throughout the winter season, use an anti-freeze solution in the cooling 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 the water which may have accumulated in the fuel filter and fuel tank in the man-
ner same as that described under “Affected areas” below.
(4) Affected areas:
When the water condensation is notched in the fuel filter, drain the 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 (water remov-
ing 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 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 the 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 level sensor. Replace.
2) Defective operation of fuel meter. Replace.
5. Noise
1) Large operation noise or vibration of fuel pump. Replace.

EN(H4DOTC 2.5)-115
ENGINE (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
T: DTC P0171 SYSTEM TOO LEAN (BANK 1)
NOTE:
For diagnostic procedure, refer to DTC P0172. RICH (BANK 1), Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
U: DTC P0172 SYSTEM TOO RICH (BANK 1)
DTC DETECTING CONDITION:
Two consecutive driving cycles with fault
TROUBLE SYMPTOM:
 Erroneous idling
 Engine stalls.
 Poor driving performance
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode OPERATION, Clear Memory Mode.> and Inspection Mode Inspection Mode.>.
Step Check Yes No
1 CHECK EXHAUST SYSTEM.Are there holes or loose bolts
on exhaust system?Repair exhaust
system.Go to step 2.
2 CHECK AIR INTAKE SYSTEM.Are there holes, loose bolts or
disconnection of hose on air
intake system?Repair air intake
system.Go to step 3.
3 CHECK FUEL PRESSURE.
Warning:
 Place “NO FIRE” signs near the working
area.
 Be careful not to spill fuel.
1) Release the fuel pressure.
(1) Disconnect the connector from fuel
pump relay.
(2) Start the engine and run it until it stalls.
(3) After the engine stalls, crank it for five
more seconds.
(4) Turn the ignition switch to OFF.
2) Connect the connector to fuel pump relay.
3) Disconnect the fuel delivery hose from fuel
filter, and connect the fuel pressure gauge.
4) Install the fuel filler cap.
5) Start the engine and idle while gear posi-
tion is neutral.
6) Measure the fuel pressure while discon-
necting pressure regulator vacuum hose from
intake manifold.
Warning:
Release fuel pressure before removing the
fuel pressure gauge.
N
OTE:
If fuel pressure does not increase, squeeze the
fuel return hose 2 to 3 times, then measure fuel
pressure again.Is measured value 284 — 314
kPa (2.9 — 3.2 kg/cm
2, 41 —
46 psi)?Go to step 4.Repair the follow-
ing items.
Fuel pressure is
too high:
 Clogged fuel
return line or
bent hose
Fuel pressure is
too low:
 Improper fuel
pump discharge
 Clogged fuel
supply line

EN(H4DOTC 2.5)-259
ENGINE (DIAGNOSTIC)
General Diagnostic Table
*1: Check ignition coil & ignitor ASSY and spark plug.
*2: Indicate the symptom occurring only in cold temperatures.
*3: Ensure the secure installation.
*4: Check fuel injector, fuel pressure regulator and fuel filter.
*5: Inspect air leak in air intake system. 7. Spark knock1) Manifold absolute pressure sensor
2) Mass air flow and intake air temperature sensor
3) Engine coolant temperature sensor
4) Knock sensor
5) Fuel injection parts (*4)
6) Fuel pump and fuel pump relay
8. After burning in exhaust system1) Manifold absolute pressure sensor
2) Mass air flow and intake air temperature sensor
3) Engine coolant temperature sensor (*2)
4) Fuel injection parts (*4)
5) Fuel pump and fuel pump relay Symptom Problem parts