I'm going to take it apart and have a better look at what's going on, maybe do some voltage drop/current draw and pressure measurements. I have a feeling that I might have to order the complete Delphi assembly again to get the Delphi pump. I'm not sure the Delphi pump will fit into the stock tank unit so that would explain some things so I'll have a look at that too. I wish I could remember for sure what pump (I think it was a Pierburg) I used when I did the replacement at around the 200k mark because I took that one apart at about 400k when I put in the Delphi as preventative maintenance and it still looked like new, almost no wear at all, and probably would have lasted the rest of the life of the vehicle.
BTW one pin on the connector for the Hella assembly looks like it's already oxidized in the RockAuto pic!

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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)