Inspect fuel leakage visually from fuel tank and fuel pump mounting point.

Inspect fuel quality and inside of fuel tank after removing fuel pump.

Check contamination of fuel filter and foreign substances in the fuel filter.

Are the fuel quality, fuel tank and fuel filter normal?

	▶ Fuel and fuel system are normal.
	▶ Replace fuel. ▶ Repair/replace fuel system.

Toxic odor.

Eyes stung.

Hard vaporizing.

Knocking suddenly after fuelling up.

Hard starting after fuelling up.(In the winter)

Knocking.

Excessive fuel consumption.

Poor power/acceleration.

Fuel system damage such as fuel pump, injector and component of the combustion-camber damage such as piston etc..

Deposit rising or corrosion. (in the engine and fuel system)

Fuel pressure decrease or Engine stalling by vapor lock.

Impossible starting by low volatile.

Discharge carcinogen.

Discharge pollutant. (CO, HC, NOx etc...)