A filter assembly for a fuel injector. In some embodiments, the filter assembly has a longitudinal axis and comprises a filter element, a filter housing, and a cap. The filter element may have a cylindrical section with a first axial end and a second axial end. The tubular filter housing may receive the filter element. The tubular filter housing may include a radial protrusion supporting the first axial end of the cylindrical section when the filter element is received therein. The cap may hold the filter element at the second axial end and encompass the filter housing along an outer circumference. The second axial end may rest directly against the cap.