I just got my boat running a couple weeks ago and was finally able to repeatedly use it over the weekend. The boat seems to get up and move around 4500-5000 RPM. I got on it the night before last and had it over 5000 for about 30-40 seconds. I looked back and had steam coming from under the engine cover. I let the motor go to idle and pulled the cover back and water was pouring out between the back of the engine and the pump. I imediately shut it down and ran the bilge pump. When I restarted the motor a couple minutes later everything was fine. I rode around for a couple hours yesterday and did not have any problems. I did not get on it as hard as I did the night before. Any idea's what caused it? Is my jet getting worn? I am running an olds 350 with Berkley Jet and a HTP pressure regulator.
A leak !!!
I would check all your hoses for any blockage or build up.