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I purchased this 99 GPX 760 last year and it wasn't running. The compression was good and it had spark so I figured rebuilding the carb would do the trick and it did. Ran it some last summer but not a lot and more early this summer and it ran great. This last trip it stopped on the water while my daughters where riding it. Had compression and spark so I figured must be a carb issue again. Pulled it apart and there was mostly water in the "float bowl" (I'm more of a dirt bike guy, not sure what they call them on these but where the gas is pumped to and where the float needle is). I thought it was odd and figured a little may have accumulated. I cleaned the carb, primed it and it fired up but would only burn the prime. It was as if no fuel was being pumped into the carbs. This was on the trailer and no hose water hooked up to it. Checked all the usual suspects for fuel supply and found no problems. Pulled the carb off a second time and it again had water in it. I also noticed that the intake manifold had what looked to be a light coating of white creamy foam on it, like when water is mixed with oil.
It sure sounds to me like I must have water in the fuel tank but in modern times that would be surprising, at least out of a station gas pump. So, my question is, is there another way the carb could be getting water in it other than pumping it from the tank? We weren't (and haven't been) riding it in really rough water or wildly, more kids and friends just tooling around. We've really have had very little water ever accumulate in the hull at all. Has anyone had a head gasket leak and water actually made it's way up into the carb? That would surprise me but maybe. Also, having tracked all the lines coming out of the tank the vent line looks like it is designed to also catch water in the plastic white "bottle." It was bone dry. What does it do and how does it work (I assume it's for condensation from the tank)?
My plan of attack at the moment is to thoroughly clean the carb again, pump all the gas out of the tank and replace it with new gas but wanted to check here and see if anyone more familiar with these has other ideas.
Any input or suggestions would be greatly appreciated.
Thanks!
It sure sounds to me like I must have water in the fuel tank but in modern times that would be surprising, at least out of a station gas pump. So, my question is, is there another way the carb could be getting water in it other than pumping it from the tank? We weren't (and haven't been) riding it in really rough water or wildly, more kids and friends just tooling around. We've really have had very little water ever accumulate in the hull at all. Has anyone had a head gasket leak and water actually made it's way up into the carb? That would surprise me but maybe. Also, having tracked all the lines coming out of the tank the vent line looks like it is designed to also catch water in the plastic white "bottle." It was bone dry. What does it do and how does it work (I assume it's for condensation from the tank)?
My plan of attack at the moment is to thoroughly clean the carb again, pump all the gas out of the tank and replace it with new gas but wanted to check here and see if anyone more familiar with these has other ideas.
Any input or suggestions would be greatly appreciated.
Thanks!