Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2016 Subaru Legacy 2.5iFACTORY OEM SERVICE PROCEDURE
Fuel System Trouble in General: Inspection
| Trouble | Possible cause | Corrective action |
|---|---|---|
| Insufficient fuel supply to fuel injector | a. Fuel pump does not operate. | |
| • Defective terminal contact | Inspect contact, especially ground, and tighten it securely. | |
| • Trouble in electromagnetic or electronic circuit parts | Replace the faulty parts. | |
| b. Decline of fuel pump function | Replace the fuel pump. | |
| c. Clogged fuel filter | Replace the fuel filter. Clean or replace the fuel tank if necessary. | |
| d. Clogged or bent fuel line pipe, hose or tube | Clean, correct or replace the fuel line pipe, hose or tube. | |
| e. Air is mixed in fuel system. | Check the fuel line connections, correct or replace the defective part. | |
| f. Damaged diaphragm of pressure regulator | Replace the fuel filter assembly. | |
| Leakage or blow out of fuel | a. Loose connections of fuel line pipe, hose or tube | Check the fuel line connections, correct or replace the defective part. |
| b. Cracked fuel line pipe, hose or tube | Replace the fuel line pipe, hose or tube. | |
| c. Cracked fuel tank or defective welding part | Replace the fuel tank. | |
| d. Clogged or bent fuel line pipe, hose or tube | Clean, correct or replace the fuel line pipe, hose or tube. | |
| Gasoline smell inside of compartment | a. Loose connections of fuel line pipe, hose or tube | Check the fuel line connections, correct or replace the defective part. |
| b. Defective canister | Replace the canister. | |
| Defective fuel gauge | a. Defective operation of fuel level sensor | Replace the fuel level sensor. |
| b. Defective operation of combination meter | Replace the combination meter. | |
| Noise | a. Large operation noise or vibration of fuel pump | Replace the 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 freezing 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.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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