Brushless DC pump with enclosed circuit board

A circuit package for use with a motor-driven pump including a pump housing, a brushless motor mounted in said pump housing, pump means mounted in said pump housing and adapted to be driven by said brushless motor;

• wherein said circuit package is mounted in a liquid passage defined in said pump housing, said circuit package enclosing a circuit board mounting thereon a control circuit for controlling rotation of said brushless motor and means for detecting a rotor position of said brushless motor, wherein said circuit board is fixed through an elastic member to an inner wall of said circuit package with a gap defined between said circuit board and said inner wall, and said circuit package is opposed to said brushless motor at a position where said circuit board is spaced a distance from said brushless motor in an axial direction of a rotating shaft of said brushless motor.