Fuel System Trouble In General - Subaru Legacy 2004 Service Manual

FUEL INJECTION (FUEL SYSTEMS)

28.Fuel System Trouble in General

A: INSPECTION
Trouble and possible cause
1. Insufficient fuel supply to injector
1) Fuel pump does not operate.
H Defective terminal contact.
H 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) 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 filler
1)
pipe.
2) Defective packing air tightness on the fuel saucer.
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 those problem. And also drain the water condensation from 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 water removing agent in the fuel system to prevent freezing
fuel system and accumulating water. Fill the water removing agent at the time when the fuel reduced at half
to maintain the advantage.
• When water condensation is noticed in the fuel filter, drain the water from both the fuel filter and fuel tank
or use 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(H4SO 2.0)-56
Corrective action
Inspect contact, especially ground, and tighten it
securely.
Replace the faulty parts.
Replace the fuel pump.
Replace fuel filter, clean or replace fuel tank.
Clean, correct or replace the 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 the packing.
Replace.
Replace.
Replace.
Replace.