Sure its not a leaking manual pump? There is a rebuild kit available for $20 or so. Finding a replacement might not be so easy. I agree with the questions, what was the diagnosis leading to failed lift pump?

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1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42