A washing machine appliance has a dispensing assembly with a supply conduit, a unitary manifold body and a water valve. The unitary manifold body defines a Venturi pump. The supply conduit extends between a reservoir and the Venturi pump such that the Venturi pump draws fluid additive from the reservoir to the Venturi pump when the water valve is open and motive liquid flows through the Venturi pump. The Venturi pump is disposed between an inlet and an outlet of the unitary manifold body within the unitary manifold body.
