First time user, so real sorry if this has been covered. Short story bought a 2001 Four Winns w/3.0 Mercruiser inboard. Still had original fuel filter, but ran good. In frustration to change filter, I just removed the entire pump. Glad I did because the cleaning it needed couldn't have been done installed. The top carb return connection (small flexible yellow tubing) was completely clogged with what looks like bits of rust. I cleaned as good as I could. Now, that port is completely clogged and the pump is frozen solid, won't budge. And no, I didn't try the pump before I started cleaning that port, but guessing I caused the clog. So, any easy fix here or time to buy a new pump?
Howdy,
Welcome aboard!
Well, it's pretty unlikely you damaged the pump cleaning the "port".
The hose is there to direct fuel from a broken/punctured fuel pump diaphragm to the carb intake.
It prevents fuel from being pumped either into the engine crankcase or bilge by directing it to the carburetor where it can be burned. The hose is yellow so you would see it (once you saw the black exhaust smoke from a really rich mixture)
It's not really a prefect system but it's there to help prevent an engine compartment fire.
If your pump is "frozen solid", you'll want to know why so you should probably remove it again and see if you can operate it by hand. If you cannot and there's anything in that hose, the diaphragm probably has a hole in it..........and yes, you'll need to replace it. Not very many rebuildable pumps around anymore.
Most of us will want to know your serial number since Mercury Marine doesn't really go by year model as much as serial number. Many 3.0L engines had electric pumps on them.
Also, you can likely get a replacement pump right here from iBoats
http://www.iboats.com/Mercruiser-Fu...0123133--session_id.628774105--view_id.269820
Supporting iBOats supports the Forum!
You can also probably get one from Napa, and other places that sell Sierra parts.....
Regards,
Rick