Clogged raw water intake?

"jzlatar-genesis" wrote in message
om...
I have a yanmar 2GM20F installed in a Plenamar 300 with the following
problem, No water coming out of the exhaust pipe with the result of
overheating and the pump is working with a new impeller, what could be
the reason for it and the solution.
Thanks in advance
Jzlatar-geminis