A Fuel Filter is a filter in the fuel line that screens out dirt and rust particles from the fuel, normally made into cartridgescontaining a filterpaper. They are found in most internal combustion engines
Fuel filters need to be maintained at regular intervals. This is usually a case of simply disconnecting the filter from the fuel line and replacing it with a new one, although some specially designed filters can be cleaned and reused many times. If a filter is not replaced regularly it may become clogged with contaminants and cause a restriction in the fuel flow, causing an appreciable drop in engine performance as the engine struggles to draw enough fuel to continue running normally.