I replaced a leaking rear KGB ballast pump that pumped water just fine but just would leak all into the bilge area. The new pump runs (I hear and feel it) but its not pumping any water. I do have the valve switch open at the rear of the boat. By opening up the hoses/connections/etc to replace the pump, did I do something that causes a need for priming the pump? I was under the impression these pump did not need priming.
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