I have the dual Sherwood pumps on my Kingscraft, and the impellers on the port engine side keep failing every ~20 hours of run time. I'm guessing there could be a couple of reasons this is happening, but wanted to run it by you guys.
Even with new impellers, the water flow through the engine is pretty low. I'm wondering if this is the cause or the symptom of the problem. I guess I need to check the flow on the output of the pump rather than the exhaust to see if it's pumping enough water. What's the best way to flush the water passages?