After replacing our fuel injector pump, we also replaced our four fuel injectors. The engine seemed back to normal as we could reach 3300rpm in neutral, no smoke, and she sounded great!! But when we put the engine into forward gear, she labored, up to 1500rpm, and started black smoke which told us she was overloaded.
Our mechanic and other boaters suggested that the turbo was not spooling up, that is as the rpm advanced, the air/fuel mixture was not adequate. Air from our turbo was not meeting the demand. The turbo (and engine) has 5900 hours, which is probably at its useful end. So our next step is replacing the turbo.
Meanwhile, here we sit in Ketchikan!
The photo is of Creek Street in old town Ketchikan.