Subaru 2009 IMPREZA Service Manual page 1013

FUEL INJECTION (FUEL SYSTEMS)
33.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 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) Clogged or bent 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) Problem in tightening of the fuel saucer gasket air
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 fuel fully to prevent the problem.
• 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.
Fuel System Trouble in General
FU(H4DOTC)-88
Corrective action
Inspect contact, especially ground, and tighten it securely.
Replace the faulty parts.
Replace the fuel pump.
Replace the fuel filter. Clean or replace the fuel tank if necessary.
Clean, correct or replace fuel pipe or hose.
Inspect or retighten each connection part.
Clean, correct or replace the air breather tube or pipe.
Replace.
Retighten.
Replace.
Replace.
Clean, correct or replace the air breather tube or air vent tube.
Correct or replace the gasket.
Replace.
Replace.
Replace.
Replace.