Light-weight electric motor driven fluid pump assembly

A light-weight electric motor driven fluid pump assembly having a thermoplastic housing of no more than two parts moldable in a conventional molding process employing straight and/or side pulls and which form a fluid impervious rotor chamber when assembled, a shaft wholly within said chamber carrying a rotor assembly wholly within said chamber and comprising a magnetic rotor forming a first part of an electric motor and a fluid impeller driven thereby thus eliminating requirement for a dynamic seal, said housing parts also defining fluid inlet and discharge ports in communication with said rotor chamber adjacent said impeller, and one of said housing parts defining a portion of said rotor chamber having a relatively thin-walled tubular configuration with a cylindrical exterior surface in coaxial relationship with said magnetic rotor, and a cylindrical motor stator disposed on and about said exterior surface for magnetic cooperation with said rotor as a second motor part.