2000 Yamaha 250 Problems

[cycholl]

I am trying to get my boat in the water again, and ran into problems starting the engine after it has been sitting for 4 months now. Initially, it would not start at all, and now when it does get going, idle speeds are all over the place (runs high and then cuts out, eventually dies). Could this be a bad fuel problem (currently have ~70 gallons of fuel in tank)? Will an fuel stabalizer help? Any suggestions to get me back in water?

 

[rodbolt]

Re: 2000 Yamaha 250 Problems

hello<br /> well its to late for stabilizer. that motor has an O2 sensor as well as 6 injectors and a vapor seperator. you may try draining the vapor seperator and testing the 3 low pressure fuel pumps. other than that maybe a new set of plugs. if it still shows problems call a pro. that motor will not hesitate to smoke a piston if there is a problem<br /> good luck and keep posting

 

[cycholl]

Re: 2000 Yamaha 250 Problems

Thanks for reply and suggestions. Did drain vapor seperator, this is what finally got engine to actually start (now is just runing real sporadic at idle speed). Also replaced plugs. I am planning to check fuel pumps. Thanks again for suggestions and reply.

 

[rodbolt]

Re: 2000 Yamaha 250 Problems

hello<br /> did you see any nasties running out of the vapor seperator? and if there was then check the VST pump filter. good luck and keep posting<br />ps if any of your buddies have a high pressure fuel rail gauge test the high pressure rail. should be about 35 psi

 

[cycholl]

Re: 2000 Yamaha 250 Problems

Fuel was a little dis-colored, but not bad. I'll try to get hold of pressure gague as suggested. Thanks for help.