It could also be the raw water hoses from seacock to strainer and to engine. I had a bearly visible cut in the hose just where the hose connects to the strainer with the clips that built overtime due to vibration. Once I stopped the engine the strainer emptied (a small amount of water only) it stopped leaking. Have a look and maybe clean the engine room and run the engine in neutral and monitor.?
It could also be in the exhaust system as the pressure pushes out the water overboard at high rpm under load.?
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David
David Godin