Not getting top RPM

Pinner58

New Member
Aug 23, 2016
13
Longport, NJ
Boat Info
1997 330 DA Sundancer, V-drivers,
Engines
7.4 Mercruisers MPI Blue
Have a 1997 Sundacer with the 7.4 mercuries. Fuel injection, V drive. Starboard engine gets up to 3000 RPM, at WOT. The bounce back and forth between 2800 and 3000. Pulled the fuel/ water filter, had some water and junk. Replaced, same issue. Switch tank and ran off the port tank,. Port engine ran great, same issue. Did dump fuel treatment in both tanks. Thinking it may be the air intake so next step is to take off and clean. In the meantime ran the starboard engine at the dock in gear and starboard engine went up to 3500, 3700 no problem. Stop at that, didn't do WOT. Bottom is clean. Can the fuel pump cause this? How would one check it? Any one else experience this?
 
A fuel pressure test would be a good way to see if the pump is operating properly.
 
Don't see how a dirty bottom will only have a effect on the starboard engine only. Bottom is cleaned ever year. Will double check anyway. Both props were reconditioned before she was dropped in this year. Will check to make sure nothing grew on it
 
Complete tuneup, compression test for future reference, fuel pressure at 3000 rpm's ?
 

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