Yes, the gravity of the water should compensate for itself on the backside except if the length is different, as it will most certainly be, but that's mostly irrelevant, in our application. The mass of the water in the system is.
The point that I was trying to make is that Head can be equated with flow resistance: all the elbows, twists and turns, the rad and, by far the most restrictive, the waterblock.
The other important point is that if you try to cram a high flow rate in a small tube size, the flow resistance actually increases. keeping the pressure at or under 5 psi will PROBABLY lower the resistance, hence the bigger tubing. But that again, is nothing compared to the waterblock.
In short, if you can figure that your rig has a flow resistance that can be calculated to 3 ft of head, then that 2 ft head pump won't do a thing for you, but churn water.
We need a plumber!
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