Thanks for the responses.
Raphael - if you see this,
On my You-tube page you commented on the Proteus trial run.
and I think you said that your proteus pump was not working.
Mine was working just fine, with the bypass valve open, the water
pumped back into the tank, You can see this when I pick up the tube and show it flowing.
When I closed the valve, the water pumped into the boiler.
The reason I am bringing this up is not to just boast about it,
but instead to see if I can help. When I was handling the estate
sale last month, I came across an engineering drawing for the pump,
and was wondering if it might help you with your problem.
I will say that I have seen it mentioned in a number of places
that it is very important to keep the pump actually pumping water
in order to keep it from running dry and ruining it.
So - have you opened up the pump and looked at the
nitrile balls that are used inside?
The drawing is a large format, I will get it scanned and post it here.
Regards,
Jim