Here's possible scenario:
If there is a filter on the end of the pick up inside the fuel tank:
The boat motion when under way stirs up crud that is in a low area of the tank close to the pick up tube. The crud is pulled to the filter blocking it and the engine dies. When the engine dies there is no longer any suction at the end of the pick up tube so the crud falls off.
ex TRUE GRIT
If there is a filter on the pick up tube it could be partially blocked all the time which would lead to poor engine performance.
I took the filter off the pick up tube inside my tank so this didn't have a chance of happening - let the down stream filter handle any garbage that came from the tank.
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