Sierra offers the largest selection of inline and cartridge fuel filters to meet the specific requirements of your engine. Direct replacement OEM filters mean you can install with confidence. Sierra filters undergo extensive testing in Real world situations and that’s why professional technicians and do-it-yourselfers around the world choose Sierra filters to protect their engine. Sierra inline and cartridge filters are tested and approved for ethanol-based fuels and meet the demands of today’s high tech-high performance engines.