Yesterday I pulled the grandkids for 3 hours on the tube,everything fine.I then went for a cruise and at 3/4 throttle all was fine then at wot it died after about 30 seconds.Took 10 minutes to get it started and got back to shore.Boat has 422 hours and is one owner and all original in pristine condition.I changed the fuel filter on top of fuel pump about 3 weeks ago.Any ideas,Tom