volvo aq130 in/out. today i replaced impeller, cleaned out heat exchanger and when i connected the mickey mouse ears to stern drive no water wants to enter the system (no water mixed with exhaust coming out. i took the inlet pipe off the bell housing that goes to sand screen then to impeller and no water is coming out the pipe. stern drive does have a plug inplace and mouse ears on full blast? i connected the water hose directly to rubber hose going to impeller and stern drive bubbles water and exhaust like normal. why won't it act normal with mouse ears? seems as if the 280stern drive won't prime.