Fuel filter assembly with heater.

摘要

A fuel filter assembly (10) for diesel fuel includes a filter head structure, spin-on replaceable element (13) and threaded collection bowl (15). An annular heater housing is secured in the filter head (12) for warming the fuel prior to passage through the filter medium (55) with a pair or positive temperature coefficient heater discs (88) providing the self-regulating heater function. A check valve (50) is housed in the inlet chamber (21) of the filter head (12) in bypass connection with the filter medium (55) to vent air from the chamber and to establish a return path for fuel from the filter. A restrictive orifice (106) in the check valve (50) limits fuel flow in the bypass path and an elastomeric duck-bill (116) type valve (110) provides the check valve function.