just open the hood and it is the fourth injector line from the front and it is not from rubbing a hole in the line it causes the line to crack and you can not believe how much fuel the cp3 can pump in a very short time. the new cummins ones are made from different metal this may stop the problem the new ones have a whiter color metal and have a torx screw instead of the 8mm head bolt for the isolator
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