Patent ID: 6668876
Filing Date: 2003-12-30
Classification: F02M,Y10T

Abstract:
A method of managing fuel vapor pressure in a fuel system, the method comprising:locating between first and second ports a poppet and a seal cooperating with the poppet, the poppet being movable along an axis, and the seal being flexible between an undeformed configuration when disengaged from the poppet, a substantially symmetrically deformed configuration when engaged with the poppet, and a generally asymmetrically deformed configuration when engaged with the poppet; positioning the seal in the substantially symmetrically deformed configuration so as to sense a negative pressure at a first pressure level; positioning the seal in the generally asymmetrically deformed configuration so as to vent negative pressure below the first pressure level; and positioning the seal in the undeformed configuration so as to vent positive pressure above a second pressure level.