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      07-18-2025, 01:37 AM   #1
JMc2018
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Drives: 2014 535i M-sport 6spd Manual
Join Date: Aug 2024
Location: Kansas City

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14' 535i - #6 injector to fuelrail fitting has micro leak

Alright everyone, any advice is much appreciated!

Just finished my valvtronic motor replacment, got everything back together and when doing my prime sequence, (the car has been down since april, so I left the injectors unplugged and following the prime guide from fcp euro)

Upon priming for the first 10 seconds, I went to check for leaks. There is the tiniest of leaks coming from the #6 injector to fuel rail fitting out the top and bottom of the nut, see photo.

It's such a small leak.. but leaking fuel is no beuno, no matter how small it is.

I have taken the fuel rail off, cleaned the fitting area, and put it back on, three different times now and to no avail, it still has a micro leak when "priming" for 10 seconds and going to check for leaks.

Aside from pulling the injector out, which would require me to get a new decouple ring and Teflon seal, (yes, I replaced both on all 6 during this job) and yes, (I know i only " have" to remove 1-4 to do this job, but i figured while I'm in here, it wouldn't hurt to replace all the seals at once . Amd this is what I get for it!!

Any ideas on what to check? I suppose the only options left are purchasing a new injector, and if that doesn't fix it, a completely new rail? Surely I am just missing a spec of sand or something preventing a perfect seal, no issues on 1-5...

Do you think NOT having the injector plugged in and allowing it to fire is causing the micro leak possibly due to the excess pressure in the injector?

Would appreciate any advice or thoughts.

ctcarbonari StradaRedlands Hoa
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