I started draining the tank and got out about 25 gallons when I saw the silver protective shield from a an oil container float by. I fished that out which may have been the problem however when I ran approx. five gallons from the portable tank the same problem occured. The engine was starving and the bulb needed to be sqeezed repeatly. The gas in the portable was clean and fresh so now I'm really confused. I'll have to pull the boat and do a diagnostic check with a dealer. I should have known, vacation just ended and we have 4 days of 90 degree weather coming.