Well, I redid my loop today with a tline. I turn the computer on and the pump starts sucking, but the Tline isn't emptying, Finally i squeeze the other line into the pump, and it starts going down. However, it's making a really loud vibration type noise, which comes and goes. By loud I mean you can hear it down the hallway faintly. It still pumps, not sure if just as powerfully, but I have no way to guage that. Any ideas?