Carl,
I had almost the same thing happened to me this weekend. Anything over 3 thousand rpm would cause the primer ball to collapse and motor to shut off. I have all new fuel lines and had just changed my fuel filter. Took the boat out the next day, ran the boat for a couple of hours, and could not replicate the problem.
Go figure?
One thing I noticed, the problem started after i fueled up.
I was thinking maybe the vent for the fuel tank maybe restricted or clogged.
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