If lube oil pressure at the pump increases suddenly, what is likely clogged?

When the lube oil pressure at the pump increases suddenly, it typically indicates that there is an obstruction in the oil flow, which is most commonly caused by a clogged strainer. The strainer serves to filter out larger particles and debris from the oil before it enters the pump. If the strainer becomes clogged, it can restrict the flow of oil, which results in an increase in pressure upstream of the strainer.

This pressure surge can lead to a variety of operational issues for the system. It is essential to regularly maintain and check the strainer to ensure it is clear of debris in order to maintain proper oil flow and pressure levels. While other components, such as the oil filter or pump impeller, can also affect the system's pressure, the immediate rise in pressure is most indicative of a blockage at the strainer.