Yamaha 225 fuel starvation

[napboater]

My 1998 Yamaha 225 runs fine up to about 3500 RPM, then motor stops. I have an in-line manual, bulb-type primer pump between fuel tanks and filter. The bulb pump collapses when engine is run for a few minutes at high RPM, indicating fuel is not getting to the pump in sufficient quantity. I have disassembled fuel selector valves, blown out gas lines and fuel tank vent lines but still no success in solving problem. Any suggestions?

 

[rodbolt]

Re: Yamaha 225 fuel starvation

hello<br /> check trhe anti-siphon valve at the fuel with- drawl tube. if its clear and not stuck the remove the draw tube from the tank. some had a filter screen in the tube. dumbest thing I ever saw but its made me a small pile of change over trhe years.<br /> anyway if the fuel system primer is sucking flat then you have a definate restriction between the bulb and the gasoline in the tank. could be the bulb but I doubt it. more likely the anti-siphon valve or the draw tube has a screen. some tubes actually thread into the 90 degree tqank adaptor and that is where the screen will be.<br /> good luck and dont keep running the motor like this. makes pistons very unhappy

 

[napboater]

Re: Yamaha 225 fuel starvation

Thanks, rodbolt, that seems like a logical solution. I'll give it a try. I appreciate your help.