I have rebuilt the carbs and the fuel pump....new fuel lines and made sure the fuel pumps through the fuel pump...when I first got it it would drop to one cylinder and then cut off, if I pumped the bulb it would pick back up and then run for a few minutes the do it all over again, so I did the above mentioned. I tested for leaks and found none. Then I rebuilt all and checked all, it still does it. If I run it on the hose I get maybe 3-4 minutes before it wants to quit, if I put it in the lake I get about a 15 sec count at 1/4 throttle then it starts to die, pump the bulb and it comes back to life...I also have tried 3-4 other fuel pumps with the same outcome.......any ides?