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Hi Barry, good morning my name is Jason.
Have you restarted it since this incident? When was the last time the impeller was changed in on the boat? What is the serial number on the engine.
The engine needs a new impeller every 2 years. they are just rubber and regardless of engine hours, they will dry rot and get stiff just from the passage of time. If the impeller is orginal it's been past due for close to 7 years now.
What I would do is check the engine oil first, if that looks good, then go ahead an try and start it and see what happens. If it doesn't start, you would want to check and see if it has any spark by hooking up a timing light to a plug wire and crank the engine over.
Let me know how you make out.
There is no pressure in the engine when the engine is off. If you look at the engine you will see a water line that runs from the top of the inner transom plate to the thermostat housing. This is the main water line. You can disconnect that line at the tstat housing, start the engine up and see if you start getting water out of that line or not. If you do not, then the impeller is toast. If you do, go ahead and hook the line back up and run the engine some more.
I think there is to many things wrong for me to try and walk you through this over the internet. I will opt out, if anybody else wants to jump in they will. Good luck.