Diesel fire pumps must be supervised for which conditions?

• A. Controller off
• B. Controller or engine trouble
• C. Engine running
• D. All of the above

Answer: (D)

Diesel fire pumps must be supervised because any change in their status can affect their readiness to deliver water in a fire. If the controller is off, the pump may not auto-start when needed, so supervision ensures someone is alerted and can intervene to start or reset the system. If there’s controller or engine trouble, supervision is essential to detect faults early and prevent a hidden failure from leaving the pump unable to operate during an emergency. While the engine is running, supervision keeps a close watch on the condition of the engine and pump so that no issue—fuel, lubrication, cooling, battery, or mechanical fault—goes unchecked and halts operation when it’s most critical. Since each of these scenarios can compromise the pump’s ability to provide water, all of them require supervision.