I had the same exact problem. What I did was siphon off some of the gas from the bottom of the tank to get whatever might be down there that was blocking up my tubes. Took the fuel lines off and cleaned them (mine had a lot of gunk in them). Changed the fuel filter and also I took my ski off of the trailer, tipped it on it's side and ran it, incase I had water in the carb bowl that would allow the water to get out of there(I had recently flipped mine and had gotten a gallon of water in the engine). I think that what your talking about is that the engine is not getting enough fuel. Clean all filters and tubes. I also ran some concentrated carb injector cleaner through the engine. I took it out the next day and it ran fine.