Detecting a fluid leak from a pump

An air-operated pump system comprising:

• an air-operated diaphragm pump comprising:
• a process fluid pathway extending between a process fluid inlet and a process fluid outlet;
• and
• a motive fluid pathway separate from the process fluid pathway, the motive fluid pathway extending between a motive fluid inlet and a motive fluid outlet;
• and
• a leak detector assembly fluidly coupled to the motive fluid inlet and the motive fluid outlet, the leak detector assembly configured to control motive fluid flow to and from the motive fluid inlet and the motive fluid outlet, respectively, responsive to detecting a leak from the process fluid pathway to the motive fluid pathway, the leak detector assembly comprising:
• a float valve movable responsive to a change in a fluid level in the leak detector assembly;
• and
• a spring-loaded spool coupled to the float valve, the spring-loaded spool configured to, in a single motion, responsive to the change in the fluid level of the leak detector assembly equal to or above a threshold level, isolate the motive fluid flow through the leak detector assembly to the motive fluid inlet of the air-operated diaphragm pump and isolate the motive fluid flow from the motive fluid outlet of the air-operated diaphragm pump.