I've just converted my truck to hydroboost and now realize I don't need the vacuum pump anymore that is hanging on the side of my 5.9 Cummins. What would you do? Block off the port and let it suck, leave the port open and let it suck, or should I disable it or remove it somehow? There's nothing in the truck that requires vacuum anymore.

 

If you don't have anything that it can be used for as a vacuum it will start blowing oil out of the breather tube.