I had a long conversation with an engineer from aeromotive yesterday about this very topic. Please elaborate on this. In my opinion you can cavitate a pump even with unlimited supply. Think of a boat propeller. Unlimited supply. Cavitation happens because of pressure differential lowering the vaporization point (boiling point) of whatever medium you are pumping, be it water, fuel, or oil, to its flash point. Add restriction to the supply side (increased vacuum, ie negative pressure) or heat in to the medium and it only gets worse.