Patent ID: 6732718
Filing Date: 2004-05-11
Classification: F02M,F04B

Abstract:
An evaporative emission control apparatus comprising:a fuel vapor adsorbing means connected to a fuel vapor generating source, the fuel vapor adsorbing means for storing adsorbent and for temporarily adsorbing fuel vapor; a fuel vapor treating means for treating the fuel vapor removed from the fuel vapor adsorbing means; and a drawing means provided on a purge pipe that connects the fuel vapor adsorbing means and the fuel vapor treating means, for drawing air though the fuel vapor adsorbing means to forcedly remove fuel vapor from the adsorbent and feed the fuel vapor into the fuel vapor treating means, wherein the drawing means has a double-acting diaphragm pump that includes a first pump chamber and a second pump chamber, one on each side of a diaphragm to draw fuel vapor.