Impeller replacement

[Bill L]

Sounds good. I’ll give it a shot

[mjk1040]

Are your engines closed or open cooling. Closed cooling should run at 160 degrees and open cooling should run at 140 degrees.

[Viper]

That's how they come from factory because they assume use in salt water but it really depends on the application. I prefer the hotter stat running in fresh water in an open/raw water cooled engine.

[Bill L]

Found the problem! I have contaminated fuel in my starboard tank. I ran both engines off the port tank, everything ran perfect! Now I have to get the tank pumped and cleaned.

[Cork the Whine]

So if the engine runs and you can't get rpm's, it might be starving for fuel. Not sure what engines you've got but I'd check the fuel filters.There's a difference between an unloaded engine, in neutral and loaded engine, in gear. I ran into an issue earlier this year, left the dock my port engine had all the power I needed, an hour and a half later coming back in bumpy seas all it would do is 1,500 rpm and it slowly dropped the closer we got to port. I picked up some junk from the fuel tank and it plugged the primary fuel filter. I've got 454 Crusaders and there's a pancake looking filter, 8 micron, that can be taken apart and cleaned.