Clean fuel is vital, because of the many small jets and passages in the carburetor and openings in a fuel injector. To ensure this hygiene, fuel filters are installed in the fuel line. Fuel filters could be located at any point among the fuel boiler and the carburetor. One may be in the tank itself, in the fuel force or in the carburetor. The most common placement is between the fuel tank and a automatic fuel pump. In this case, the fuel enters a glass bowl and passes up during the filter screen and out through an outlet. Any water or solid material which is attentive by the filter will fall to the bottom of the glass bowl where it can be simply seen and removed. Dirt particles typically come from scales of rust in the tank cars, storage tanks or drums. Water comes from strong moisture in the fuel tanks.