Fuel System Trouble In General - Subaru Legacy 2002 Service Manual

Fuel Injection (Fuel Systems)
30. Fuel System Trouble in
General
S145571
A: INSPECTION
Trouble and possible cause
1. Insufficient fuel supply to the injector
1) Fuel pump will not operate.
k
Defective terminal contact.
k
Trouble in electromagnetic or electronic circuit parts.
2) Lowering of fuel pump function.
3) Clogged dust or water in the fuel filter.
4) Clogged or bent fuel pipe or hose.
5) Air is mixed in the fuel system.
6) Clogged or bent breather tube or pipe.
7) Damaged diaphragm of pressure regulator.
2. Leakage or blow out fuel
1) Loosened joints of the fuel pipe.
2) Cracked fuel pipe, hose and fuel tank.
3) Defective welding part on the fuel tank.
4) Defective drain packing of the fuel tank.
5) Clogged or bent air breather tube or air vent tube.
3. Gasoline smell inside of compartment
Loose joints at air breather tube, air vent tube and fuel
1)
filler pipe.
2) Defective packing air tightness on the fuel saucer.
3) Cracked fuel separator.
4) Inoperative fuel pump modulator or circuit.
4. Defective fuel meter indicator
1) Defective operation of fuel level sensor.
2) Defective operation of fuel meter.
5. Noise
1) Large operation noise or vibration of fuel pump.
NOTE:
¼ 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 com-
pletely.
(2) Drain water condensation from the fuel fil-
ter.
¼ Refilling the fuel tank.
Refill the fuel tank while there is still some fuel left
in the tank.
¼ Protecting the fuel system against freezing and
water condensation.
(1) 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 cool-

FUEL SYSTEM TROUBLE IN GENERAL

S145571A10
FU(H6)-76
Corrective action
Inspect connections, especially ground, and tighten
securely.
Replace fuel pump.
Replace fuel pump.
Replace fuel filter, clean or replace fuel tank.
Clean, correct or replace fuel pipe or hose.
Inspect or retighten each connection part.
Clean, correct or replace air breather tube or pipe.
Replace.
Retightening.
Replace.
Replace.
Replace.
Clean, correct or replace air breather tube or air vent
tube.
Retightening.
Correct or replace packing.
Replace separator.
Replace.
Replace.
Replace.
Replace.
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 accumu-
lated in the fuel filter and fuel tank in the man-
ner 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.
¼ Observe the instructions, notes, etc., indicated
on the label affixed to the anti-freeze solution
(water removing agent) container before use.