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I had a 2004 Mercruiser 4.3L V6 I/O. Does it also stutter at idle?!? One year I didn't change my fuel/water separator. Well it started to run like crap/stutter as you put it. Once I changed the filter and ran some seafoam through it it slowly burned through the watery fuel..... it ran fine!!!I have 2004 RL 251 with the 350 MPI. Just a few minutes ago the boat has started studdering at full throttle. I'm thinking full filter? Please help.
Your 250 SHO should also set off an alarm and go into limp mode if it is a fuel water seperator issue. There is a sensor in those filter/seperators. That would make me also lean towards it being a different issue if you don’t have the alarm and limp mode happening.High jacking this thread, lol…. Had this issue on my new 2022 24 LSB, SPS+ w Yamaha 250 SHO.
Had no idea what was going on, but started with ROM dropping out when trying to go full throttle, but ok at 4500 and lower…. Later in they day after tubing a bit, started losing throttle(drop outs) at 3500RPM and lower…. Noticed when pulling the kids in that the primer bulb was sucked flat, so I know it’s a fuel flow issue.
I can’t imagine it’s the fuel/water separator, but I can check it I suppose. Where are the vents and how should I check them for the tank? Any other things I should check? 43 hours on. The motor, and just had the break in service about 10 hours ago….
Thanks!
Definitely didn’t hear an alarm…. Seems like a venting issue hopefully. I’ll probably replace/empty the filter just to check it anyway.Your 250 SHO should also set off an alarm and go into limp mode if it is a fuel water seperator issue. There is a sensor in those filter/seperators. That would make me also lean towards it being a different issue if you don’t have the alarm and limp mode happening.