Abstract: A fuel filter assembly (10) for filtering diesel fuel includes a filter head (12), a spin on replaceable element (13) and a collection bowl (15) removable from the element. The element includes a casing with a turned-in edge portion at a lower end. An adaptor ring (69) is supported on said edge portion inside the element and includes an annular threaded portion (71). The collection bowl has an outer peripheral wall (74) with an annular threaded portion engaging the threaded portion of the adaptor ring. The outer peripheral wall of the bowl has an annular shoulder abutting the turned-in edge portion of said casing to clamp said casing between the adaptor ring and the bowl, when the bowl is attached to the element. A seal (76) between the shoulder and the casing further serves to hold the element and the bowl in fluid tight relation.

Abstract: A fuel filter assembly for diesel fuel includes a filter head structure, spin-on replaceable element and threaded collection bowl. An annular heater housing is secured in the filter head for warming the fuel prior to passage through the filter medium with a pair of positive temperature coefficient heater discs providing the self-regulating heater function. A check valve is housed in the inlet chamber of the filter head in bypass connection with the filter medium to vent air from the chamber and to establish a return path for fuel from the filter. A restrictive orifice in the check valve limits fuel flow in the bypass path and an elastomeric duck-bill type valve provides the check valve function.