Which water pump are you talking about? The raw water pumps have a rubber
impellor while the fresh water pumps have a metal impellor.

With all the informtion you have provided it is clear as mud.

wrote in message
ups.com...
I have a rebuilt Yanmar water pump that I believed was for a 2GM20 /
3GM30 it has a metal impeller.
I would very much appreciate a "heads up" on which Yanmar this might
fit.