What is the purpose of intake and discharge pressure gauges on a pumper?

• A. Intake gauges measure discharge pressure and discharge gauges measure suction pressure.
• B. Intake gauges indicate suction pressure; discharge gauges indicate the pressure on the discharge side to verify nozzle pressure and system performance.
• C. Intake gauges regulate flow; discharge gauges control pump speed.
• D. Intake gauges measure ambient pressure; discharge gauges measure atmospheric pressure.

Answer: (B)

The main idea is to monitor pressures on both sides of the pump so you can manage water supply and delivery effectively. Intake gauges measure the suction pressure as water is drawn from the source, helping you verify the pump is properly primed and that the source isn’t losing prime or restricted by leaks or dry conditions. Discharge gauges measure the pressure on the output side, letting you see the actual pressure reaching the hoses and nozzle so you can verify nozzle pressure and overall system performance. Together, these readings show whether the pump is drawing water reliably and delivering the correct pressure through the hose lines, accounting for friction losses, elevation, valve settings, and nozzle requirements. If intake pressure drops, you may be losing prime or drawing from a weak source; if discharge pressure doesn’t match the target nozzle pressure, you adjust throttle, pump settings, or hose configuration to achieve the desired flow.