Briggs & Stratton 394358S Fuel Filter Assembly 75 Micron The fuel filter will be located either inside the fuel tank or fitted into the fuel line between the tank and the fuel pump. Some engines have internal, non-serviceable fuel filters. Before doing any small engine repair or maintenance, be sure to check your manual for recommendations on specific parts numbers and safety precautions. Amazon: EVIL ENERGY Inline Fuel Filter 6AN 8AN 10AN A fuel filter is a filter in the fuel line that screens out dirt and rust particles from the fuel, normally made into cartridges containing a 100 micron stainless steel filter element. They are found in most internal combustion engines. Features include anodized billet aluminum body and end caps for durability and resistance to fluid corrosion.