Abstract: The present disclosure relates to an on demand lubrication system for use in torque transfer mechanisms of the type associated with power transfer systems in motor vehicles. The on-demand lubrication system includes an externally-mounted electric motor/pump assembly adapted to draw lubricant from a sump located within the dosed housing of the torque transfer mechanism and supply pressurized lubricant to one or more remote locations within the housing. The output of the electric motor/pump assembly is fluidically connected to a reservoir assembly via an elongated conduit.