Just did this last week on my dual fuel pump 91. Process is exactly the same. This should be added to the DIY WIKI. It was one of the few things for the W124 that's not in there, even though it is a simple job.
I've never touched the filter on my car and I've owned it for 60K. I'm guessing the old filter had at least 100K on it, if not more (oops).
