A tandem pump with a pump housing that includes a first pump portion with a first pump inlet and first pump outlet. The pump housing further includes a second pump portion having a second pump inlet and a second pump outlet. Within the pump housing is a rotatable common shaft that extends between the first and second pump portions. A first pump chamber that includes a first pump element with a first pump outer rotor surrounding a first pump inner rotor. The first pump inner rotor is connected to a first end of the common shaft. A second pump chamber has a second pump element operationally connected to a second end of the common shaft located opposite the first end of the common shaft. A stator is positioned in the first pump portion of the pump housing and circumscribes the first pump outer rotor.
