<... The water flow will want to follow the path of least resistance, and I'm sure there will be leakage through the second pump back to the first's inlet - it has to be less resistance than the radiator(s) and engine block ...>
Seems to me that if there is little enough resistance that the water back-flows through the dead pump, then they could be plumbed in series.  If there is too much resistance to plumb them parallel, then back-flow shouldn't be a major problem.  Of course if a cheap, simple, reliable check valve should appear ...

Just a theory ... Jim S.


"Robinson, Chad" wrote: