Standard procedure for fuel system problem diagnosis is to run off an auxiliary tank and see if the problem goes away.
Please do this next.
There have been lots of diagnostic possibilities mentioned. If we can isolate the problem to the boat's part of the fuel system ( tank, filters, - anything before the fuel pump) or the engine's part of the fuel system (fuel pump, carburetor) we will be able to drill down into the cause of the problem pronto.
By posting the problem on the forum you have already called a mechanic(s).
Why do you need to call another one? No one person has the collective A4 wisdom of this forum.
TRUE GRIT
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