I recently purchased a 2005 Holiday Rambler Admiral. The water pump was working great, then I decided to drain and sanitize the water system. After I filled and flushed the system the pump started to act up. It will cycle on and off rapidly at low flow, seams to be OK at high flow, but when I turn the water off the pump will cycle on and off for a second or two before shutting off completely. I noticed an air pocket in the filter at the pump inlet, could that be the problem? If so how do I purge the air. The pump is a SHURflo #2088-422-144, 2.8GPM with a filter at the inlet side. It appears to be the original pump. Any help or suggestions would be greatly appreciated. Thanks