Workings of fuel tank gauge -
The "real" fix (irregardless of what kind of hoops MB tries chasing you through) is to disable this whole "virtual calculation" BS. It can be changed in the instrument cluster (with the MB shop computer, SDS) to operate only off of the actual fuel level sender, and it'll work great. I hope this helps
ps I see on your profile you have a 98, unsure if the early ones used the virtual calculation method or not.
I like your handle, why B52?