During a run, how should a pump operator interact with the engine governor?

• A. Override to fixed engine speed for the duration of the run.
• B. Let the governor automatically adjust engine speed to maintain target discharge pressure; manual override only for essential actions.
• C. Disable the governor to prevent fluctuations.
• D. Use a separate throttle to slow the engine without governor.

Answer: (B)

The main point is that the engine governor should control engine speed to keep the discharge pressure at the target. The governor automatically adjusts RPM as the pump load changes, so flow and pressure stay steady and the engine isn’t overworked or slowed down too much. Manual override should be used only for essential actions—otherwise, removing automatic control can cause pressure fluctuations, surges, or engine stress. So the best practice is to let the governor manage speed to maintain the target discharge pressure, with manual overrides reserved for only necessary adjustments. The other options would bypass or defeat the governor, leading to unstable pressure or potential engine damage.