Toaster yes the pump does reply on the gasoline for lubrication but I am running 15% coolant in my system which will suffice for lubrication. In my pump the actual motor turning the gear box is sealed off in a water proof section of the pump body so it is not exposed to the water. It used a water pass through for cooling. I have this pump running for 48 hrs in the system now and temperatures are a few degrees lower than with my previous a/c pump so its not really adding too much heat to the water. We will see how long it lasts but it should last quite a while.
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