I think that I might have a cavatation problem talking to "Flytime". I think that i have a solution that might fix the problem. I was thinking that the hand hole, inspection cover, is where the cavatation happens, because of the sharp angles and high point of the pump. I think that you could relieve the air that would be trapped up in that area of the pump, by drilling and tapping a hole in the top cover and using a one way check valve. The check valve would allow that high pressure air that is stuck up in the top of the pump at the hand hole, to be pushed out with the incoming water pressure. You would lose alittle water pressure but if you make the hole small enough like a 1/4" tube that you run through the back of the boat, you would never notice the drop in pressure at the pump. When you get off the throttle and shut the boat off, air will not suck back thru the check valve sort of making a vacuum in the pump. Let me know if anyone has ever heard of something like this or even if im on the right track, with the cavatation.