Motorcycle Petrol Fuel Filter The most common failures for motorcycles and mopeds are fuel related issues, it is important to replace your fuel filter at regular service intervals to prevent harmful particles entering your fuel injectors or carbs. Tiny amounts of grit can also enter your engine through the fuel system causing your engine to prematurely wear even the toughest of engines. We advise changing your fuel filter with a high quality replacement regularly, lower quality filters can still allow small particles to pass through.