it depends, theres two different types,, if you have the one with the plastic (or metal) pipe coming out of the front of the case facing the rear thats good, you can just put a piece of vacuum line on it and run it up to the firewall or something, if you have the one with the green capped barb type deal facing the drivers side or passenger side of the vehicle, just pop the cap off and run the vacuum line... the pump MUST come out if you wanna do this right.. the one with the long plastic vent gets held in by the pump, and it just slides in the case, some of the metal ones are pressed in or screw in style.. hope this hlps.. nate