[zinner]

I had the injector return line fail (split open) on the 335d. I am replacing both lines 13537799869 and 13537811577. Is this a symptom of a failing injector (over pressure the line) or something I am not aware off? The lines seem fairly brittle. Let me know if you have any insights

13537799869 was the line that split open right before injector 1 at the clamp (blue circle). 13537811577 is getting replaced because the plastic T broke when trying to remove that one time clamp.

[32valves]

I had to buy the whole line for one connection

[32valves]

Originally Posted by 32valves

I had to buy the whole line for one connection

And used a dremel cut off wheel to remove the steel clamp

[Nadir Point]

Try buying an intake charge pipe coupler from a dealer and see how many pieces it gets you! 😂

[Yozh]

OP, your failure is most likely mechanical from someone either laying some weight on it or cracking it during install/removal.

[Nadir Point]

Commonrail injector lines are also prone to fail from improper torque during install. They are one of the more critical torque specs such as head bolts, stuff like that.

[zinner]

Nadir this was the return line so no torqued fittings. I replaced the lines and buttoned up the car no more issues! I will chalk it up to just being old and failing.