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IT COULD BE, IT COULD , IT COULD BE..........
Once the engine starts pull wire off spark plug. If the engine runs better on three cylinders it could be a exhaust system problem.
Rig up a auxiliary fuel tank directly to the fuel pump, bypassing the boats part of the fuel system. It could be a blockage in the pickup tube in the fuel tank or a blocked filter. Run the electric fuel pump straight from the battery. It could be something in the wiring circuit to the fuel pump.
Does choking the engine the engine help? It could be something weird in the carburetor.
Report back with the result of these tests. We'll tell you what to do next.
Others will have other approaches and ideas. Consider them also.
As noted a fuel pressure gauge would be a useful diagnostic tool.
ex TRUE GRIT
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