Patent ID: 6391194
Filing Date: 2002-05-21
Classification: B01D,F02M

Abstract:
A filter device for a fuel supply system of an internal combustion engine of a vehicle, comprising:a housing; a filter insert arranged in said housing to define a dirt side and a clean side; means forming at the dirt side a supply opening through said housing for connection to a fuel container; means forming at the clean side an outlet opening through said housing for connection to an internal combustion engine; means forming a return opening through said housing for connection to the fuel supply container from the dirt side; valve means for controlling flow through said return opening, said valve means having a movable wall bounding a portion of said clean side and of which is loaded with a fuel pressure at the clean side, said valve means having a rod which is displaceable by said movable wall and extends through said filter insert from the clean side to the dirt side, said movable rod having an end region which is arranged at the dirt side and controls flow through said return opening, said end region closing said return opening until the fuel pressure at the clean side exceeds a predetermined value and moves said movable wall and end region connected thereto away from the return opening to release the fuel pressure at the clean side.