I think MB updated the pump when W140 got its facelift in 1995. The newer pump is quieter when operating, and reacts alot faster then old one. Though it's not confirm, it's just my experience. At least, that's how it feels when compare mine to my GF's parent's 1995 S320.

Andy Kuo

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• 1992 Mercedes-Benz 400SE
  
• Pearl Grey/Black Leather
  

ICQ#26950002
Mercedes Owners ICQ ActiveList ID#61730549
Mercedes S-Class Page
http://akry.web.com