Injector Fuel Supply Tube leak cm2350

[SquareOne]

How many times have you guys removed and re-torqued the fuel supply tube coming from the HPFP to the rail? This is on a CM2350. This would be my 4th time (HPFP inspection, then HPFP internals replacement, then HPFP head replacement, and finally, 2nd HPFP internals replacement). Wondering if my luck has run out on removal and reinstalls for this line.

Unfortunately, this time I can't get it to stop leaking at the fitting on the fuel pump head.. I've removed, cleaned, reset, and re-torqued the line 3 times, but still a slight leak. It's not even a drip. After it sits overnight, I can wipe my finger at the bottom of the fitting and get fuel on it. Never had any issues the other 3 times I've removed the fittings, but this time doesn't seem to be working out. Every time I've done this, both ends have been retorqued to 35lb/ft with no leaks....I'm guessing there's only so many times they can be removed before failure. Really don't want to put anymore torque, since my assumption is it will most likely leak worse.

Before I just replace the fitting in the HPFP head as well as the injector supply tube, just want to be sure there isn't something I'm missing.

[Rawze]

Are you sure it is not runoff from a leak somewhere else?

and yes, those high pressure metal to metal fitting only have so many times they can be removed and replaced, as they wear a bit each time.

[SquareOne]

(10-04-2025 )Rawze Wrote:  Are you sure it is not runoff from a leak somewhere else?

Yep, everywhere above it is dry. Originally I thought it may have been a runoff as well. The seems to be slowly collecting within the securing nut and can be seen at the base of the nut when wiped after a few hours of sitting.

(10-04-2025 )Rawze Wrote:  yes, those high pressure metal to metal fitting only have so many times they can be removed and replaced, as they wear a bit each time.

Makes sense. I figured the sealing surface gets slightly deformed with every re-torque. At some point I guess it's too worn to seal like it once did. I'll just go ahead and order the parts. After 11 years and nearly a million miles, I think it's paid it's dues lol