Having a problem with my starboard engine. A 1989 150hp Yahmaha. What
happens is the engine will not keep up high rps, i.e it will hit like 4K
like the other engine then die down to 3K or so. If I pump the bulb it
keeps up just fine. I had this problem a few weeks ago and I found one
hose clamp was loose and replaced it and it worked like a champ for
80+miles. But now it’s back and all the clamps look good. We just
replaced the fuel pumps and it’s a little better, i.e. dose not die out
as fast etc. I think it’s some type of vacuum leak if so how can I
tell? Any other thoughts?

Thanks,

Frank