Patent ID: 6352067
Filing Date: 2002-03-05
Classification: F02M

Abstract:
A returnless fuel system pressure valve comprising:a valve housing having a pair of half sections, with each of said half sections having a valve receiving portion and a nipple for attachment to a fluid bearing device, said valve housing also having a valve center portion for attachment with said pair of half sections so that said pair of half sections cooperate to form a valve chamber; a check valve mounted in said valve center portion within said chamber and operable to allow fuel flow from said pump to said fuel line upon said fuel pump delivering a predetermined fuel pressure to said fuel line; a pressure relief valve mounted in said valve center portion within said valve chamber parallel to said check valve and operable to allow fuel in said fuel line to flow through said housing to said fuel pump upon fuel pressure in said fuel line exceeding a predetermined relief pressure greater than said predetermined fuel pressure; and a parasitic flow orifice mounted in fluid communication with said valve chamber and operable to allow fuel in said valve chamber to flow through said parasitic flow orifice to said fuel tank when valve chamber pressure is below a predetermined valve chamber pressure, said parasitic flow orifice preventing fuel in said valve chamber from flowing through said parasitic flow orifice when said valve chamber pressure exceeds said predetermined valve chamber pressure.