I had the same problem and changed the pump. Same thing happened Again when the supercharger got hot. There is a good description with pictures illustrating how to wire the pump to cut it on when the ignition is turned on. It works great all the time. I believe there is a heat sensor that is bad, not the pump.

Check out the forum for how to wire the pump on with the ignition. It only takes a short piece of wire and terminal connectors. If it doesn't work, the connections are easily removed.

Good luck.