Subaru LEGACY 2006 Manual page 698

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30.Fuel System Trouble in General
A: INSPECTION
Trouble and possible cause
1. Insufficient fuel supply to injector
1) Fuel pump does not operate.
Defective terminal contact
Trouble in electromagnetic or electronic circuit parts
2) Decline 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 air breather tube or pipe.
7) Damaged diaphragm of pressure regulator
2. Leakage or blow out of fuel
1) Loose 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 filler
1)
pipe
2) Fuel saucer gasket air tightness fault
3) 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:
• 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. Also drain water from the fuel filter.
• In snow-covered areas, mountainous areas, skiing areas, etc. where ambient temperatures drop below
0°C (32°F) throughout the winter season, use a water removing agent in the fuel system to prevent freezing
fuel system and accumulating water. Add water removing agent again when the fuel level is reduced to half,
to maintain the effect.
• When water is accumulated in fuel filter, drain water from both the fuel filter and fuel tank or use water re-
moving agent in the fuel tank.
• Before using water removing agent, follow the cautions noted on the bottle.
Fuel System Trouble in General
Inspect contact, especially ground, and tighten it
securely.
Replace the faulty part.
Replace the fuel pump.
Replace the fuel filter, and clean or replace the fuel tank.
Clean, repair or replace the fuel pipe or hose.
Inspect or retighten each connection part.
Clean, correct or replace the air breather tube or pipe.
Replace.
Retighten.
Replace.
Replace.
Replace.
Clean, correct or replace the air breather tube or air vent
tube.
Retighten.
Correct or replace the gasket.
Replace.
Replace.
Replace.
Replace.
FU(H4SO)-59
FUEL INJECTION (FUEL SYSTEMS)
Corrective action