I have been having problems with my engine losing power around 3500 RPM's when I am pulling the tube. I ran yesterday for several WOT passes and it ran perfecty. 67.7 on GPS @ 5600RPM's on an A cut When I add drag to the boat though it runs perfectly up to the 32-3500 mark then I can hear and feel the motor "bog" down. I can floor it and get it going again but it will return to the "bog" when it gets back to the mid RPM's. I thought it was a fuel delivery problem initally and replaced all the fuel lines and cleaned the electric carter fuel pump. It had rust debris in the screen. It seems to work fine even in the problem RPM's for a few minutes, but once it starts even shutting down and letting the fuel pump run for a bit does not stop the problem. Anyone have any ideas as I am stumped and am leaning towards a pump issue now?? Could the loader be overloading?
Thanks for any and all ideas on this.