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I just turned my power steering into a manual steering box. The act of turning the wheels forces the fluid out/back. That is how the pump was helping you turn. Now that you supply the turning force you are pushing some of that fluid out the outlet and back through the inlet. It is how the power steering assist is setup inside the rack. Reading this site and others it mostly states to make sure you have some loop from the output of the rack (input to the pump) back to the input side of the rack (output of pump). If you just cap off the rack then you really have to work harder to turn the wheel.
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