Although many sites list a part number, there is no replaceable filter on a W210 PS pump.
If the pump is working, I'd guess the seals in the rack have gone bye bye.
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Terry Allison
N. Calif. & Boca Chica, Panama
09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)
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