Can 300E fuel pumps work but still be bad?

[sptt]

I was just reading about the new Class Action Lawsuit against BMW concerning their N54 Engine and the high pressure fuel pumps that are causing problems with acceleration lag when they don't perform at 100%.
Is this something that the old W124's could also be experiencing causing hard starts and slow acceleration from a stopped position? I have noticed that my car sometimes has get up and go when sitting at a light and other times...barely seems to want to get up and go. My car has 2 fuel pumps. Will replacing just one make a difference if so?