For a little information on a unusual application of a producer-do a search for "humphrey pump cobdogla".This is the only actual Humphrey pump still in existence.The Humphrey pump is actually an internal combustion engine with a liquid piston-which is the fluid being pumped.This one in Cobdogla Australia is the existing one of a pair installed to dewater a huge area and due to it's huge appetite for fuel and remote location, had a large gas producer set up to burn the local wood. This thing moved 1.25 MILLION gallons of water per minute. A good description and pictures of the pump here but the producer is long gone.
