US 7,540,276 B2
Fuel-vapor discharge structure in a fuel tank for engine apparatus
Satoshi Makino, Shizuoka-ken (Japan)
Assigned to Yamaha Motor Power Products Kabushiki Kaisha, Shizuoka (Japan)
Filed on Aug. 28, 2006, as Appl. No. 11/511,525.
Claims priority of application No. 2005-246306 (JP), filed on Aug. 26, 2005.
Prior Publication US 2008/0178851 A1, Jul. 31, 2008
Int. Cl. F02M 33/02 (2006.01); F02M 33/04 (2006.01)
U.S. Cl. 123—518 29 Claims
OG exemplary drawing
 
1. A fuel-vapor discharge structure for a fuel tank comprising:
a communication passage between an upper space of a fuel tank and outside of the fuel tank;
an extraction portion disposed at a bottom of the fuel tank, wherein a portion of the communication passage includes a conduit having an upper portion terminating at an open end of the conduit and a lower portion extending into the extraction portion so as to support the entire conduit within the fuel tank in an erect configuration;
an air induction system, wherein a distal end portion of the communication passage disposed outside the fuel tank is in flow communication with the air induction system so that fuel-vapor from the upper space enters the engine; and
a one-way valve disposed in the fuel tank and configured to allow fuel-vapor to pass from the conduit to the air induction system only when a fuel vapor pressure of the fuel vapor exceeds a predetermined pressure.