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Uponor 8 loop manifold

I read a similar problem on this site but it wasn't quite the same. So, here it goes.
I have an 8 loop Uponor manifold that I was trying to purge but absolutely has me stumped. I hooked a hose up to both bibs and closed all the loops with the exception of the inlet and outlet of one loop. With the bib cap tool I then opened each of the fill and drain valves. I even loosed them so much they came out of the bib valve but still no water. I disconnected the hose from the bib and the line has pressure but once I hook them up to the bib valves I get nothing.

Any help would be greatly appreciated!

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