How do you verify a pump is delivering water to the discharge side?

• A. Observe discharge gauge, listen for flow, check water at discharge outlets, verify nozzle flow with a flow meter if available.
• B. Start the engine and assume delivering
• C. Look at exhaust temperature
• D. Check priming valve only

Answer: (A)

Verifying water is on the discharge side relies on direct indicators that water is actually moving through the discharge path. You’d check the discharge pressure with the gauge to confirm there’s flow against the system’s demand, listen for the sound of flowing water, and physically inspect the discharge outlets to see water exiting. If a flow meter is available, you’d verify nozzle flow to quantify the actual rate. Using all these cues together confirms the pump is delivering water to the discharge side, not just running or building pressure elsewhere.

Starting the engine and assuming water is flowing can be misleading because flow might be blocked, valves could be closed, or there could be leaks. An exhaust temperature reading doesn’t tell you about discharge delivery, and a priming valve check alone doesn’t prove water is moving to the discharge path.