Question 27General Subjects - 1st Asst/Chief

The correct answer is C) The suction strainer is clogged. If the bilge pump is developing good vacuum but unable to discharge any water, the most probable cause is a clogged suction strainer. A clogged strainer would prevent water from being drawn into the pump, even though the pump itself is functioning properly. The other options - a clogged discharge valve, worn wearing rings, or a worn shaft - would not prevent water from being drawn into the pump in the first place. Therefore, a clogged suction strainer is the most likely explanation for the described problem with the bilge pump.