To maintain a close fit within a metering pump, the pumped fluid is usually what before entering the pump?

Maintaining a close fit within a metering pump is crucial for accurate fluid delivery and optimal performance. Straining or filtering the pumped fluid before it enters the pump helps to remove any solid particles or contaminants that could interfere with the pump's internal mechanisms. This is particularly important in metering pumps, which rely on precision and a consistent flow rate to function effectively.

If the fluid contains particulates, it can cause wear on the pump components, leading to decreased efficiency and potential failure. By straining or filtering the fluid, the integrity of the close fit is preserved, ensuring smooth operation and accurate metering.

While the other options might influence the characteristics of the fluid or pump performance in different contexts, they do not directly address the need for a clean fluid to maintain the precision required in a metering pump. Therefore, filtering or straining the fluid is the most relevant and effective method to achieve a close fit and ensure the pump operates efficiently.