What should the engine RPM be maintained at for proper priming?

To ensure proper priming of the pump when operating a mobile pump, maintaining the engine RPM in the range of 1000-1200 RPM is optimal. This RPM range allows for an adequate supply of power to generate the necessary vacuum for priming the pump effectively. It strikes a balance between providing enough energy to draw water into the system while minimizing the risk of engine strain or overheating, which can occur at higher RPMs.

If the RPM is too low, the engine may struggle to produce the required vacuum pressure, which can delay or prevent successful priming. Conversely, operating at too high of an RPM may create excess turbulence or cavitation in the pump, which can be detrimental to its performance and longevity. Therefore, the 1000-1200 RPM range is established as the most effective for this important function.