Hey QSilver7 good to see you again.

Re. realoem diagrams. I have gone through them and I saw the expansion tank for the diesel cars, but I have no idea where that is located. These are shown in this diagram.

http://www.realoem.com/bmw/diagrams/n/r/221.png

So what can I check to fix this problem? If ventilation is not done to the environment, what can cause this problem?

And no, I do not get any codes in the computer.

in the Freightliner I used to have trouble fueling, I checked the lines and ran a couple doses of injector clean and diesel rescue. helped a bit but still kinda slow (keep in mind diesel will fuel slower then gasoline but it took twice as long to fill) I let the cap loose for the night while i parked and in the AM ran the pump through a couple priming cycles (off and on w/o turning on the motor) and when i filled up again it filled up pretty quick. may or may not work for you.
Also turns out the station i went to next (Exxon/Mobil) had well maintained pumps and catered mostly to diesel so that had ALOT to do with

So what you are saying is that I leave the fuel cap loose before going to fill up? Hmmm, that's something worth trying.

yep put the cap on but dont tighten it so it can air out. Also the next morning run it through a couple cycles like i mentioned and see if it helps. Also DO NOT drive with it lose/off (learned that the hard way on my ford, forgot to tighten it after fillin up :P)

I know this is an old thread! But I’ve been searching and searching for someone that had the same issue!! It’s a struggle just to get half a tank full because it takes forever. I’ve only had my X5 for a short time and it’s really doing my head in not being able to fuel up in a timely manner! The nozzle forever clicks off every couple of seconds if I have it inserted into the fuel tank, and with it slightly out or all the way out the diesel just bubbles on out and I have to slow the flow right down so that it is fueling so bloody slow! Please tell me you worked out the issue and fixed it?

Never solved the problem!

I also have the 3.0d and never had any issues with it. I don't use truck pumps (with the large bore nozzles) as they won't fit in the filler neck. The standard diesel pumps here in NZ will fill my ~93l tank from near-empty to full in around 3-4 minutes. It's certainly slower than filling a petrol car but it's certainly not anything like 10 minutes.

The filler neck hoses are pretty small - this tank will never fill VERY fast...

https://i.ibb.co/CsBkfM5/7xOonHF.png
https://i.ibb.co/qY90M85/7xYq2En.png

I wish it was 3-4 mins for me.. 15 mins if I want to fill it full.. I usually stop at 5-10 mins...

AFAIK the fuel tank system is set up to vent as little as possible and most of the venting is supposed to be built into the fill nozzle. Maybe try filling at a different station ?

I have the same issue when filling the PORSCHE. I found out that if you flip the nozzle so that the handle is pointing up in the air instead of pointing down in the ground, I can fill the PORSCHE without it clicking off all the time.