The leak detect pumps function is to pressurize the gas tank and and make sure the system does not have any leaksThis item is part of the Evaporative emissions system, which is required to be functioning to pass inspectionOften mounted in the Rear Passenger Wheel WellFor Passat 1998-1999-2000-2001-2002-2003-2004-2005Previous Versions 3B0906201, 3B0906271
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Brand: VW, Model: 3b0 906 201 a