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    NHC 250 Cummins Oil Pump

    Checked the oil pressure for a second time with a different gauge on my M812 NHC250 Cummins. The oil pressure bounces all around from 41 to 27psi. Mainly shows around 30 psi but when rpm increases the oil pressure actually decreases. I'm thinking I have a bad relief in my oil pump. My...
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