Quote Originally Posted by Holst View Post
That definately wont work as the pump will push water the wrong way down the injector and back into the inlet of the pump.

Although flowrate through the pump might increase flow through the CPU will decrease.

The water will take the path of least resistance.
I think you're still missing the point here:
INJECTORS ONLY DIRECT THEIR FLOW FORWARD (from the outlet), NOT BACKWARD (through the suction port).
The suction port is called that, because it causes suction to exist. The suction port provides no external pressure, and therefore cannot return fluid to the source. You would have to completely BLOCK the flow from the injector's outlet for the injector to stop working. Then and only then would you see backflow. And that's simply not going to happen.