Most of the people I spoke with when I was studying the process told me their pumps smoked. What I found is that when the pump was “sucking” it would smoke once it achieved full vacuum it would not.
In the bagging of the hull when I closed the valve to the pump to see if it would keep a vacuum it fell faster then the US economy so the pump was really “sucking” I was hoping the feds would show up and throw money at me, er well I’m not a bank or auto maker. When are they going to bail out the sailors look at the costs of boats and sails!