Abstract: A pumping system includes a pump for pumping a liquid, a motor for driving the pump, and components for coupling the pump to the motor so that the speed at which the pump is driven varies automatically according to the load the liquid imposes. One embodiment employs an automotive fluid transmission with a torque converter for this purpose, along with input and output manifolds that enable connection to differently sized lines. These components may be mounted on a portable support structure, such as a cart, to form a fully automatic, portable pumping system arranged so that a user can manually move the system to a desired location, connect to variously sized lines, and pump any of various liquids having different or varying viscosities.