Can this be done while boat is in the water?

I heard from someone today that it cannot. If you had a fresh water flush system could you close that valve, acting like you were going to flush the motors motors or doesn't that cut it?

I appreciate the help.

Are you talking about the engine mounted pump on a bravo?

Yes

You can do it in the water, once the hose from the transom is pulled loose, just hold it above the waterline, if you drop it in the bilge it can siphon water in. Usually you can just wire it up or over to the side to get it out of the way. Normally it is best to pull the pump assembly off, replace the impeller and plastic housing, and replace the lube for the fuel pump arm if you have a fuel pump/water pump assembly.

what's the lube for the fuel pump arm? haven't heard anyone mention that before, it is a fuel pump/water pump assembly. What type of lube do I need and what's involved in that job?

Thanks.

In the chamber between the pulley and the actual water pump there is a one lobed cam that drives the mechanical fuel pump arm. It is lubed by a small amount of oil. Over time fuel seeps through the fuel pump diaphragm and contaminates this lube. Ideally it should be changed every year. There is a screw on the side that is the level plug. If you take off the pump from the motor, you can drain it from that hole then hold it straight and refill it to the level of the hole with either 30w oil or gear lube.

It can be done just like TedG said. I always use Merc HP drive lube for the fuel pump lube.

I keep a short 3" peice of 1" (I think) PVC pipe with a cap on it to plug the hose in my tool box for the times the pump goes out on teh water.

Thanks guys...........learned something new today.

I'm done now, guess I can go home.