Hye Troy I just bought a YS 110FZ from a guy, I put it on a GP geebee,, and started it for the first time today, I have a check valve, filter all the stuff is plumbed correct,, well I can start it up and it idles great and the transistion is fine,till about 3/4 throttle, as the rpms jump up past(ballpark figure) 7-8 thousand, all of a sudden I can see the fuel go out of the intake line going from the front of the engine the the clunk line on the tank,, , and the motor sags and I can let off the throttle back to below say half throttle and the fuel will suddenly shoot back in to the intake line,,, but like I said I can transistion good but when it shoots up to high rpm it acts like it sucks the intake line dry,,, (and it almost looks like it is sucking the fuel back in the tank ,very quickly),, but then I can drop the throttle back down to 3/4 throttle or below, and it fuel returns back in the line,, thanks for any info troy or anyone,, thanks,