Well...first off, based on my own experiences, get ALL the air out of the sytem first...or as much as you possibly can.
The reason I say this is that air pockets in the system are compressable. The pump may be applying pressure to the water but if the water is hitting an air pocket, the air pocket will just act like a spring. The increased back pressure produced may then be MORE than the pump is capable of overcoming. So the pump will just sit there pumping but water will NOT actually be flowing.
I saw this happen in my system using a high pressure 500GPH pump when it was set on VERY low flow rate settings (my pump has a variable flow rate control knob).
Secondly, the 150GPH pump is more than likely going to be knocked down to some rediculously low flow rate when it's all said and done. Whether the LOW flow rates actually harm cooling performance significantly is a hot topic that is still vigorously debated and thus far inconclusive due to lack of formal testing.
It would be my *recommendation* to aquire a pump with a little more 'ooomph'.
I suspect your problem with no flow is directly related to either one or both of these two issues I mention. Tho I could be missing something...wouldn't be the first time.
Good luck.
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