Patent ID: 6260410
Filing Date: 2001-07-17
Classification: F02M

Abstract:
A method of initializing an evaporative emission space of a fuel storage system of an automotive vehicle preparatory to performing a leak detection test on the evaporative emission space, the vehicle being powered by a fuel-consuming engine and including an evaporative emission control system for purging fuel vapor from the evaporative emission space to the engine for combustion therein during conditions conducive to purging, the method comprising:creating a differential between pressure in the evaporative emission space and, atmospheric pressure sufficient to perform a leak detection test;alternately increasing the created pressure differential above a nominal pressure differential and decreasing the created pressure differential below the nominal pressure differential, a plurality of cycles over time, within a range of differential pressures sufficient to perform a leak detection test; and thenisolating the evaporative emission space from communication with both the engine and atmosphere, and performing a leak detection test.