Ok, I just jumpered pins 30 & 87, and the fuel pumps started running. So the relay is definitely bad. It's MB part No. 002 545 16 05.

What I don't understand is why the relay from my 87 wouldn't work?

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Current cars:
2000 ML55 AMG, 174k miles
2003 C240 T-Modell, 202k miles
1995 S320, 207k Miles