Not even close to the only one.

They seem to break at the injector more than anywhere else, seldom in the middle of the line even if there is a wear point from broken clips.

I did have one break on a Cat engine in my first motorhome (inside the valve cover), filled the crankcase with several gallons of fuel until it hit the crank, I experienced my first diesel runaway on the freeway going through Chicago.

As far as the #6 re-design: I have a set of the new "inclined injection" lines (for the 3.5L cars) for my new engine, didn't like the design so I adjusted the angle on a set of 3.0L lines from the original engine to install instead. I don't know why #6 was re-routed, I would assume for better durability, but perhaps it isn't a good design. I have a couple of spare sets around, hopefully I won't need them as I've had to pound a line shut on a manhole cover once (the aforementioned Chicago incident) to get home, don't want to do it again (they never fail in the driveway).

__________________

Gone to the dark side

- Jeff