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