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on a mech pump the spring controls the psi and the cam lobe just recocks the arm. If a pump that is supposed to do 6 is putting out 12 lbs it very well well have the wrong spring in it. could send it back or if you're inclined take out the pivot shaft to remove the spring & check it for tension amt if you are able to do so or see what the pump mfr recommends EDIT I missed that you have an electric pump ahead of it. Yes you'll need to regulate the psi down for sure. thought that was very off that a 6lb pump is producing 12 psi

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