Posts: 3480
Location: Elk River, Minnesota | Hiya,
I'd consider looking at the fuel line itself. If it has too much of a bend in one area, it will kink off, and not allow fuel to flow like it should. Had this happen on my current boat...threw me for a loop until I spotted it. Only happened about a minute after getting up to WOT...if I backed off, no issue...
Usually (but not always) a bad primer bulb will show problems at slow speeds more than high speeds...high speed means fuel is flowing and the ball in the primer is out and away. When a primer bulb goes bad, it usually does not seal properly to prime the system...hence horrible starting. A fuel filter could have potential to be a big problem since restriction within the filter can hinder top end performance. Definitely replace that....it is one of those overlooked pieces which is easy enough to clean or replace (depending on which style you have). Replace every couple of years anyway (if not yearly)
As for an impeller...that alone will not cause engine cut-out/sputtering (IMHHO)...Its not linked to anything engine related other than to keep cylinder walls cool to save freeze up. A bad impeller would cause overheat which usually will shut the engine down until it cools. Over time, this could quickly reduce engine life, but is not what I would consider the cause of your sputtering.
Replacing the plugs yearly (to me) is a very worthwhile thing. After starting the engine and running it for the first time (getting all the gunk from winterizing out) replace the plugs...amazing how a little fouling on a plug can have an overall effect on engine performance.
Clean replace fuel filter, check fuel line for kinks, new plugs, Fresh gas, an a deep decarbonizer (Mercury powertune or similar to seafoam directly into the carb/throttle body throat), and I'll bet you are good to go...
Steve
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