I take off from the dock to head out fishing. I fish my spot for 45 minutes and decide to move to another spot. I start the enging, put it in gear , It runs for 20 seconds or so and dies. When this happens i pump the primer ball until it gets full , start the engine and take off and it seems to run fine. Every time i stop to fish it seems todo this time after time. Does anyone have any idea what could be going on here? Thanks guys