Hi, I have a 1993 Ski Nautique that will not run at high speed. I rebuilt Holly carburetor at end of season and replace fuel filter. The boat starts up fine; I can idle ok, however when I try to accelerate, it starts but within 10 seconds it starts to miss and bogged down and engine dies. I am able to started it and idle home. I have try twice to run it and got the same issue.
Could bad gas cause this condition? I have been running motor once a month during winter for about 10 minutes. The problem started at end of season. Don’t know much about the ProTec system but now that Chris mentions it I do remember reading several posts about their problems and it certainly sounds familiar. But my first thought was as Benj suggested – check the anit-siphon valve. While you have stuff disassembled back there I’d shine a light down in the tank as well to see if there are any particulates/ sediment that may be clogging the system intermittently. Again not very common, but when I was rebuilding mine last year I had to drain the system to get the tank out and you wouldn’t believe the amount of crud and sediment that was in the bottom of the tank that took me hours to get out.
This is definitely worth checking though. Years ago I had a hot rod Chevy that had remarkably the same symptoms. We went through everything, which included new fuel pumps, rebuilding the carb and changing not only the fuel filter but several fuel lines as well. Ultimately it turned out to be a ton of sediment in the fuel tank that would float around and under the right conditions and under high demand it would clog the lines and starve the system. After stopping, it would settle and allow the fuel to flow again, miraculously letting me continue, until the next time. This is why I thought it so important to get every las bit of crud out of my tank before reinstalling last year.
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