Fuel Injection (Fuel Systems): Diagnosis Subaru Forester SG

INSPECTION

Make sure the fuel pipe and fuel hoses are not cracked and that connections are tight.

Scheme 8

Scheme 9

1. Disconnect the ground cable from battery.
2. Remove the air intake duct and air cleaner assembly. Refer to «REMOVAL»(ref-200787-S34281602712005102300000) , Air Intake Duct and «REMOVAL»(ref-200787-S24445141242005102300000) , Air Cleaner Case.
3. Disconnect the connector from the engine coolant temperature sensor.
4. Remove the engine coolant temperature sensor.

1. Make sure there are no cracks, holes, or other damage on the fuel tank.
2. Make sure that the fuel hoses and fuel pipes are not cracked and that connections are tight.

Connect the lead harness to the connector terminal of fuel pump and apply the battery power supply to check whether the pump operate.

Scheme 10

1. Check the inside of fuel filter for dirt and water sediment.
2. If it is clogged, or if the replacement interval has been reached, replace it.
3. If the water is found in it, shake and expel the water from the inlet port.
4. If fuel hoses are damaged at the connecting portion, replace it with a new one.
5. If clamps are badly damaged, replace with new ones.

1. Make sure that there are no cracks on the fuel pipes and fuel hoses.
2. Make sure that the fuel pipe and fuel hose connections are tight.

Scheme 11

Note. When the vehicle is left unattended for an extended period of time, water may accumulate in the fuel tank. To prevent water condensation. Top off the fuel tank or drain the fuel completely. Drain the water condensation from the fuel filter. Refilling the fuel tank. Refill the fuel tank while there is still some fuel left in the tank. Protecting the fuel system against freezing and water condensation. 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 cooling 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 the water which may have accumulated in the fuel filter and fuel tank in the manner same as that described under Affected areas below. Affected areas When the water condensation is notched in the fuel filter, drain the water from both the fuel filter and fuel tank or use a water removing agent (or anti-freeze solution) in the fuel tank. Observe the instructions, notes, etc., indicated on the label affixed to the anti-freeze solution (water removing agent) container before use.