Ahh... I see it now...
Yeah you are going to have to keep the pump input line below water level. Not a big deal really although right now it will require removing the liquid from the loop. With a big daddy pump in your last pictures I would not think it would be a big deal as long as you prime the feed line. But... bleeding would be tough.
If there is nothing coming out of the output, there is nothing going in the input. Pressure does not mean much if it is vapor locked by a big ole air bubble...
In theory....
if you have about 3-4' of intake hose inside the cooler... fill it... put your thumb over the end of it... put it all back in the cooler under the water... power up the pump wait a second or two and remove your thumb.. this should provide enough liquid to keep the circuit going.
Not a water cooling guy, but do have some experience with pumps.
you could also use a small pump to prime the feed line for the big one until the loop is bled (should only have to do it first start up...)
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Special relativity is not "Eat Two Big Macs."
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