running all day the boat ran really good. We stoped to fish and after sitting for a bit we moved. When my wife started the baot it started and ran then cut off. She pumped the ball which was'nt that empty. Boat started agian then cut back off. I checked and lifted motor a bit and started it and it started fine then cut off. checked the pump ball it was full started motor agian it ran and I disengaged forward and reved motor up to 1500rpms and it continued to run. Engaged forward gear and we motored along. We ran thr boat slow and up on plane for 7 miles to boat dock as we pulled in it cut out agian. Fuel filter was replace several months ago along with pump ball. Fueled boat that morning with 40 gallons and oil to 50:1. After tying uo boat started and ran then cut off. I rebuilt the whole lower end and water pump. Did not cut off on high temp or bog down. Any Ideas?????? We ran fo 5 hours before this happened