Hi all

Some advice on where to look next would be greatly appreciated. I have
a Yanmar 2GM diesel engine that stops pumping water through the
cooling system after I have been out sailing for the day. To get it
started pumping again; I need to let the boat sit flat in the water
for about an hour. I have changed the impeller, but still have the
problem. The only time this seems to happen is when I have the boat
heeled over for a few hours.

Any ideas?

Thanks
Trai