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My guess is that the front is raised to help eliminate an air pocket in the rack itself. The reason for filling that full is probably for initial fill up and will drop as air is sucked out on initial application of vacuum. And depending on where the return hose is in the reservoir, it might help get fluid into the system from both sides as air is drawn out. You might get more hose and get your pump vac pump higher and let it sit for longer with vacuum applied.
Is air bubbling out when vacuum is applied?
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