You may have posted this already, but Where did you take your boat for repair????
The basics you have covered, Fuel, oxygen and spark.
Reading your post it is fuel starved. Why? Good question.
Before I'd spend much more money try this if you can. Attach another fuel source to your engine (portable) and see what happens.
I don't know if that's practicle on not but if you do it and it runs great then it might be your fuel pump? If it still does the same thing then the fuel pump probably isn't the answer.
Good luck and let us know.
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