Injector Fuel Filter With Built-In Orifice for Flow Restriction

Abstract

Apparatus and method for substantially reducing or eliminating pressure pulsations caused by the opening and closing of fuel injectors. A preferred embodiment provides a restriction orifice adjacent the inlet end of a fuel injector filter of a respective fuel injector.

1 . A method for reducing pressure pulsations in a fuel injector comprising:
 a) providing a fuel injector filter for locating in said fuel injector located in an inlet end of said fuel injector, said fuel injector filter including a filter media; and   b) providing a restriction orifice located within said fuel injector filter upstream of said filter media; and   c) passing fuel through said restriction orifice prior to passing through said filter media, thereby reducing pressure pulsations in said fuel injector.   
   
   
       2 . The method of  claim 1 , wherein said fuel injector filter includes a body wherein said filter media is disposed within said body. 
   
   
       3 . The method of  claim 2 , wherein said restriction orifice is a separate part connected to said body. 
   
   
       4 . The method of  claim 2  and further comprising the step of integrally forming by injection molding said body and said restriction orifice. 
   
   
       5 . The method of  claim 1  wherein said fuel injector filter has a fuel inlet end and fuel outlet end and further comprising the step of positioning said restriction orifice adjacent said inlet end. 
   
   
       6 . The method of  claim 1 , wherein said fuel injector filter is positioned within a longitudinal passageway of said fuel injector. 
   
   
       7 . The method of  claim 1  wherein said body of said fuel injector filter is connected to said fuel injector using a filter connector.