What is the most common cause of inadequate reciprocating bilge pump discharge?

The most common cause of inadequate reciprocating bilge pump discharge is a clogged suction strainer. The suction strainer is designed to filter out debris and contaminants from the water being pumped. If it becomes clogged, the flow of water into the pump is restricted, which directly impacts the pump's ability to discharge water effectively. This obstruction can be caused by various materials such as dirt, oil, or debris from the bilge water.

When the strainer is not functioning properly due to clogging, it can lead to reduced pump efficiency, resulting in inadequate discharge regardless of the pump's operational condition. Therefore, maintaining a clean suction strainer is critical for ensuring that the bilge pump operates at its designed capacity. This aspect of pump maintenance is essential for keeping the bilge area clear of water, which can help prevent excessive listing or stability issues on board.