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low rail pressure

  1. 06-07 LBZ & LLY Duramax Powertrain
    Hey everyone, I have a 2007 Lbz creeping up on 190k miles. truck has been tuned through Ppei for the last 20k miles. I recently started having low fuel rail pressure. So far I have changed the fuel filter, and installed a Ppe race plug. In the 150 tune im seeing 26k desired rail pressure and...