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Dan, see this solenoid switch on the firewall by the battery? Unplug this and it will stop the vacuum from going to the front hubs. If things work with this unhooked, then you know the leak is one of the hubs. Don't forget about the vacuum lines behind the glove box.
My solenoid in this pic is unpluged so I could use 4x4 low, without haveing the front hubs lock.
Here's a pic of my vacuum pump, looks like I am missing something. Can anyone confirm this and if so what is missing?
I looked a little closer and I see you don't have the vacuum line coming off that right side nipple. There should be a hose coming off that tit that go off to the right of the white piece. The line goes to the other side of the pump. I can't quite see where it goes yet. I will look futher. I was wrong in the first post.