Btw, just out of curiosity, what is the boat and where is it located? The
boat discussed in the thread I referenced is a 1989 S2 (built on and for
the Great Lakes, afaik) that is now in San Francisco.

Hi there

Thanks for the reply - the boat in question is a Sunstar 28 and is
located in Vancouver BC.

I took a look at that thread and there is a lot of information there.
There are some differences in the problem however. The pump on this
boat will work any time, for as long as I want it to run, its only
after sailing (motor off) and the boat being heeled over for a long
period that it gives trouble. After about a hour of sitting at the
slip its all ready to go again. I am stumped