Howard wrote:

Paul:
    Cavitation is a phenomenon resulting from restricted suction..... a pump
with a restricted outlet will not cavitate.... it will stall..... a
different phenomenon, and not  harmful to a pump as cavitation is.   Actual
cavitation results in greatly increased wear and will literally eat away at
the metal in a pump......   I believe there is a confusion of terms
here.......In cavitation water goes to vapor under suction....  basically
the same thing as happens when a vapor lock occurs in a car.

                                                                H.W.

That is interesting Howard. I did not know there was a distinction.
In that light I don't know whether the Mazda pump is stalling or 
cavitating. Since it is a closed loop, pressurized system how can 
you tell?

Paul Lamar
 
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