An in-tank fluid filter has a filter body made of porous material and a plastic outlet port attached to the filter body for connecting the filter to a pump. A plastic retainer is integrally formed on the outlet port, the retainer comprising a tab extending in a plane perpendicular to the flow axis, the tab having a first surface proximate the pump and a second surface remote from the pump, the tab having an aperture extending from the first surface to the second surface with an effective cross-section at the first surface that is larger than the post cross-section and that is reduced toward the second surface to an effective cross-section that is smaller than the post cross-section.