Billet Specialties Billet Fuel Filters are designed for carburated applications and are available with a smooth or ribbed design in black anodized or polished finish. These fuel filters are designed for 3/8 in. fuel line and connect inline via  3/8 in.hose barb or -6 AN fitting. Each filter measures 4-1/2 in. long with a diameter of 1-3/8 in.