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  1. T

    Cummins 8.3L ISC fuel getting into oil

    Thanks I appreciate the feedback but not looking forward to the repair!
  2. T

    Cummins 8.3L ISC fuel getting into oil

    I"m curious if the injection pump fixed the fuel in the oil issue. I have a 2000 ISC in an RV that started making oil. I had the oil tested and it came back with 10% fuel in the oil. I was suspecting O rings but heard it could be the pump. Did you replace the O rings and pump yourself, if so...
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