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  #11  
Old 12-17-2024, 01:08 PM
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The kit I used was a GB 8017 and it was probably from RockAuto, that's for the M54 so maybe check if that works for you. Your choice if you want to use the silicone compound or the regular black for the rail.
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  #12  
Old 12-17-2024, 01:34 PM
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Thanks! RockAuto only lists the GB 8008 as compatible with my N62:

https://www.rockauto.com/en/moreinfo...486&cc=1432929

Nice that they have good URLs you can post for your vehicle:

https://www.rockauto.com/en/catalog/.../+o-ring,13679

Is the best way to diagnose the injectors as the likely culprit to look for fuel on the rail when the smell happens again? I've taken off the engine cover for quicker access if it repeats.
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  #13  
Old 12-17-2024, 01:48 PM
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Yep, visual, running with the engine cold or maybe even better to jumper the fuel pump relay so you don't need to run the engine and when you find a leak wipe it and watch to make really sure it's only the o-ring leaking and not the injector itself.
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  #14  
Old 12-17-2024, 08:41 PM
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I appreciate the advice. I took a bit longer trip today, not so cold, about 12 C. There was no noticeable fuel smell at start up or at the end of the trip.

I'm interested in finding out what to do if some of the old o-ring remains stuck to the wall, like BimmerBreaker mentioned?
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  #15  
Old 12-17-2024, 08:51 PM
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Old o-ring getting stuck left behind isn't really a thing afaik but if it is then clean it off. Blow the dirt off around the injectors the best you can and spray a bit of lube or rust penetrant around each one before you pull them/the rail out. It might take some wiggling or even prying so a bit careful with that. That's IF the problem is even that.

Maybe pay attention to which way the clips are on because sometimes that matters and of course lube the new rings.
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Last edited by 80stech; 12-17-2024 at 08:58 PM.
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  #16  
Old 12-17-2024, 09:40 PM
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The old o-ring getting stuck in the rail happened to me on multiple injectors. The injector was stubborn to pull out on those where it happened, as the injector had to be pulled "out" of the o-ring.

It wasn't an issue at all though other than the injector being stubborn to remove. You just use a pick tool to take the o-ring out of the rail. The o-rings were otherwise intact and it's the only engine I've ever seen this happen on.

Replacing the injectors or refreshing them is overall an extremely simple job. I wouldn't overthink it, it will be extremely obvious how everything goes together once you get to it. The hardest part is getting the rail off, as you have to move the electrical harness boxes out of the way and that can be quite annoying. I did mine with the engine out, so it wasn't that big of a deal for me - but I removed all the rear connections and draped the electrical stuff forward over the engine. With the engine in place you'd probably want to use bungee cords or something to pull them away from the engine...


Personally though, I doubt the issue is a leaking injector - a leaking injector won't leak only when cold and in fact you'd smell it more and more the more you drive it. There is a vent line that may have deteriorated, which will only be open to the tank (more correctly, to the charcoal canister) during certain times - so this may be possible, but I am not sure the exact times these engines do that DMTL test. It could also just be some sort of vacuum leak, as the engine runs richer during startup, so you may be smelling excess unburnt fuel if there is any sort of vacuum leak present.

IMO it certainly merits further diagnosis.
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  #17  
Old 12-17-2024, 11:26 PM
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Anyone who doesn't realize that an o-ring is more likely to leak in the cold probably is too young to remember the space shuttle!
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  #18  
Old 12-18-2024, 12:21 PM
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Quote:
Originally Posted by 80stech View Post
Anyone who doesn't realize that an o-ring is more likely to leak in the cold probably is too young to remember the space shuttle!
... and probably doesn't live in Saskatchewan, where, in winter, it's colder than deep space

Great input from both of you guys. I'm hoping it's simple to diagnose.
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  #19  
Old 12-18-2024, 12:33 PM
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So true Cheers!
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  #20  
Old 01-27-2025, 09:41 PM
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Update: I took the engine cover off a few weeks ago. I haven't been able to reproduce the fuel smell. A friend stuck his nose in the motor and wasn't able to smell fuel on a cold day and we used a flashlight and didn't see any fuel on the rails.

Still no codes on the Foxwell.

I'm going to hold off on any repairs for now. Maybe I was just being too sensitive to a normal fuel smell now that my mechanic friend, who had done all the work on my X5 since 2003, has passed away.
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