I took my boat out of storage, started the engine at home with muffs and it sounded and ran fine. I got to the lake in the water and it started sputtering, making a whining/whistling noise and then it died. I towed it back home, checked the fuel filter (which was replaced recently during a fall tune-up), and checked the spark plugs (they were grey in color). I tried many times to restart the engine, I believe the fuel pumps are running but not working properly. It appears there is no fuel getting to the engine. What should I do to troubleshoot next? This was the first attempt to run the boat after having been in storage all winter....help!