I don't know why this is happening, but I made this manifold out of copper pipes and for some reason the march pump craps out when I hook it up. It starts out strong, and I get a good spray coming out of the little holes I made, but then after 30 seconds it stops flowing.
If I disconnect the manifold, the pump works fine. If I reconnect it, the same thing happens. 30 seconds of good flow, then a tapering off. The thing that confusing is the slow taper of wort pressure over 30 seconds. If it were clogged it would just stop.