"JimB" wrote in message ...
"Jeffrey P. Vasquez" wrote in
message new

You can check most pumps by taking the cover off and turning the engine over
with the starter while holding the fuel cut-off. If the vanes don't turn,
there's a shear failure somewhere or a missing key, and that's your problem.
If they do turn - your pump is almost certainly OK. Back to the partial
blockage . . .

jUST adding a little, Did you replace the wear plate on your pump? Is
it a jabsco? If it is a jabsco and you did not replace the wear plate
that might be a good place to start. Are you getting the same amount
of water out of your exhaust? If so than its you fresh water pump, or
like jeffery said perhaps your heat exchanger is clogged up.


Good luck

Joe

Have fun. Maybe someone who knows your Yanmar will give you a better story.