E39 I've worked on and changed pump. It does have a saddle tank but does not have the deep well for the pump which is a big improvement for taking turns and hills.

In researching the e53 fuel supply found plenty of posts where e39 drivers would take a hard ledt turn to slosh fuel to the right side at the first sign of fuel starvation. That's really not going to work on e53. The trade off of the deep well is by the time that is dry there's no warning

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)