A fluid driven pump. One embodiment of the fluid driven pump may include first and second diaphragms supported within a housing assembly such that first and second fluidtight expansion chambers are defined within the housing. The pump may have a first exhaust valve movably supported in a first exhaust valve cavity in fluid communication with the first expansion chamber and an exhaust port in the housing assembly. In addition, the pump may have a second exhaust valve movably supported in a second exhaust valve cavity in fluid communication with the second expansion chamber and the exhaust port. A flow control system may be supported by the housing assembly and be couplable to a source of pressurized control fluid. The flow control system may control flow of pressurized fluid into and out of the first and second expansion chambers such that pressurized fluid entering the first expansion chamber flows through a first passage in the housing assembly independent from a first exhaust passage which connects the first exhaust valve cavity to the first expansion chamber and such that pressurized fluid entering the second expansion chamber flows through a second passage in the housing assembly independent from a second exhaust passage connecting the second exhaust valve cavity to the second expansion chamber.