Abstract: A filter assembly includes a header, a bowl and a replaceable filter element. The bowl is indexed to have a single installed orientation with respect to the header. The filter element is keyed and indexed to both the bowl and the header, with index structures on the filter element engaging complementary coding structures on both the bowl and the header to define a single installed orientation of the filter element with respect to the filter assembly. The filter element lower end cap includes a notch and the filer media defines a longitudinal channel corresponding in position and configuration to the notch in the lower end cap. The lower end cap and channel in the filter media engage a protrusion inside the bowl. The bowl maintains angular orientation (prevents twisting) of the upper and lower end caps when the filter media is exposed to high differential pressures.

Abstract: A filter assembly includes a header, a bowl and a replaceable filter element. The bowl is indexed to have a single installed orientation with respect to the header. The filter element is keyed and indexed to both the bowl and the header, with index structures on the filter element engaging complementary coding structures on both the bowl and the header to define a single installed orientation of the filter element with respect to the filter assembly. The filter element lower end cap includes a notch and the filer media defines a longitudinal channel corresponding in position and configuration to the notch in the lower end cap. The lower end cap and channel in the filter media engage a protrusion inside the bowl. The bowl maintains angular orientation (prevents twisting) of the upper and lower end caps when the filter media is exposed to high differential pressures.

Abstract: A fuel filter assembly includes a header and a can-shaped housing removeably attached to the header. The can-shaped housing has an upper rim portion provided with a plurality of notches therein. A filter unit has an upper end cap provided with a plurality of tabs extending from the periphery and positioned within the notches of the housing. The spacing of the notches about the axis of the housing must be the same as the spacing of the tabs about the axis of the filter unit to permit the filter unit and housing to be properly assembled, thereby preventing the use of an incorrect filter unit within the housing. Additionally, the header has a plurality of key slots that receive the tabs on the filter unit. The spacing of the key slots and tabs must be the same to permit the housing and received filter unit to be properly connected to the header.