Clean fuel is important because there are small jets and passages in the
carburetor and opening in a fuel injector. The fuel filter is responsible for
keeping the smaller contaminants in the system out of the engine and other fuel
delivery components. On carbureted engines these contaminants can cause clogging
of orifices or jets and cause the vehicle to get too much or not enough fuel.
To ensure this cleanliness, fuel filters are installed in the fuel line. On today's fuel injected vehicle, the opening in the injectors is extremely small and can be easily clogged causing fuel delivery problems. Filters can be located at any point between the fuel tank and the engine fuel rail. The most common placement is mounted on the underside frame rail between the fuel tank and engine.
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