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but the pressure will be higher before a highly restrictive block than after it exits
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That is true.
Say you put a static pressure monitor right after the pump, and another one on the outlet of your block. In that case, the pressure on the outlet would change as you changed the blocks location in the setup. But if you placed both monitors before and after the block, it will never change for a given flow rate.
I thought that pumps are not good at pulling, but still can pull a bit once you have liquid in them. Hence the reason MR sees no air getting pulled in when his res is open. I had the same effect when I opene my res, and it was on the bottom of the case too. It's not just gravity pulling the water down. Correct me if I'm wrong though.