2008 mercury 25hp efi 4-stroke not hit full rpm's

Boomdog19

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May 17, 2019
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Hello everyone.
I am new to this and I hope i'm doing this right.
I have a 2008 mercury 25hp efi 4-stroke on a 16' aluminum Crestliner. My problem is that the engine rarely hits full power anymore which was (21mph) and RPM's 5500. Its full power is now mostly between 11 mph and 15 mph and only 4600 rpm. I initialy found my fuel/bulb line had internal deterioration so i replaced it and the motors fuel filter to no avail.
I next brought the boat to a marina and they claimed to have cleaned the entire VST assembly
and replaced its internal filter screen, but that also did not help. I returned the boat to the marina and they claimed they ran all testing and found no issues. I have just ordered a low pressre fuel pump to basically attempting to start shot gun repair this problem for lack of direction.
Has anyone see a similar problem or have any ideas?

 
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