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injector return line

  1. General Discussion
    (Sorry in advance for the long post but any opinions/help would be greatly appreciated). I recently picked up a 2006 GMC Sierra 2500HD with an LBZ engine. Truck is 100% stock besides a 4” MBRP exhaust in its current state. Bought the truck needing a fuel pressure regulator because the truck was...
  2. 04.5-05 LLY Duramax Powertrain
    So I have a 2005 LLY Duramax crew cab and I’m new to the Duramax diesel world and I’ve only owned the truck since October 2019 til now and the truck just turned over 205k miles. Now my question is, would a leaking injector return line cause injector knock? The passenger side, #7 injector, return...