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  1. WillWagner

    NHC 250 Cummins Oil Pump

    Check the suction tube for being hard/brittle. It sounds like it's taking air. If the regulator was stikcing, the pressure would still go up with engine RPM, it would just seem a little slower than normal. BTW, those pumps are completely rebuildable. Buy the parts and do it yourself. It's very easy.
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