Vane pump and vapor leakage check system having the same

A vane pump comprising:

• a housing including
• a cylindrical part,
• a first board closing an end of the cylindrical part in an axis direction, and
• a second board closing the other end of the cylindrical part in the axis direction, wherein a pump chamber is defined among the cylindrical part, the first board and the second board;
• a rotor having an approximately column shape rotatably arranged in the pump chamber, the rotor having a center hole passing through the rotor in the axis direction at an approximately center position, and a plurality of vanes slidable on an inner wall of the housing;
• and
• a motor having a shaft fitted into the center hole of the rotor, the motor rotating the rotor by rotating the shaft, wherein
• an imaginary plane is defined to bisect the pump chamber in the axis direction,
• the housing has a first inlet port and a second inlet port located symmetrical with each other with respect to the imaginary plane,
• the housing has a first outlet port and a second outlet port located symmetrical with each other with respect to the imaginary plane,
• the first outlet port is located at the end of the cylindrical part in the axial direction, and extends in a radial direction of the cylindrical part, and
• the second outlet port is located at the other end of the cylindrical part in the axial direction and extends in the radial direction of the cylindrical part.