Vickers and ZF are *not* the same.
Here is a description, with photos, of my ZF pump rebuild/reseal. Hope it helps.
http://www.peachparts.com/shopforum/showthread.php?threadid=63549
If everything else was done correctly, my suspicioin is that your impeller vanes (you'll see what they are in the above link) are not sliding in and out of their slots as they should.
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2008 E350 4matic / Black/Anthracite
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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black
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