I am putting a new water pump impeller in my 50 hp merc and noticed that connection between the water pump outlet (the notched, conical riser on top of the pump) and the bottom end of the tube going up into the top of the engine doesn't seem to be tight. There is a washer inside the upper pump housing below the outlet, but the topside of the outlet is just hard plastic. Should there be a rubber tube seal on the bottom of the riser pipe? Seems like a really loose connection which would explain why my tattletale is always pretty weak. I've hunted around the various parts sites and there seems to be 2 types, a straight piece of rubber tubing and a piece with a lip on one end. Can't find either in a diagram of my engine, but they are both listed as parts for it.
