http://www.youtube.com/watch?v=jsgWAnmvKeg
Don't worry it looks like an amazing amount of gas sprayed everywhere but it's exaggerated by the phone camera being about 4cm from the leak.
It was a holy crap amount of leak though and absolutely why my car starved of fuel with 15L or something remaining.
I just replaced the electric pump a couple weeks ago and I'm curious if the new pump with more pressure blew or the o-ring or the old pump actually had more pressure to overcome the leak because I could drive to zero DTE just a month or two ago, I perform that test about 3-4 times a year.
This job could be done in about 90 minutes especially if you have a helper. As I was photographing and inventing it probably took me about 3 hours.
About the sixth time I've done the remove a fuel pump procedure on an x5, this was the first of all the future times where I removed the back seat bottom.
It is captive by the center position seat belt. It takes a 16mm socket and several hundred ft·lb of torque to remove the rusted in bolt but with the right power tool it was simple. (was a bit of a challenge to get the rusted bolt started to put back in but still quite worth it, fighting the damn seat bottom the entire time really gets on your nerves).
Putting the seat bottom back in; push the center male buckle through the seat and latch it: since it is floppy, it will fight you trying to put it up through the hole in the seat.
The other two are pretty easy: pretty much ignore them, get the seat lined up and start to push the back down into place, the left and right female buckle should be lined up with the holes but flat forward, there is enough give in the leather to reach a skinny finger in and pull the front edge vertical into the hole.
At that point just pound the seat backwards with your fist then down again with fist it should snap right into place.