Im pretty sure the fuel pump relay is behind the battery next to the computers and the ovp relay. If you remove the relay you can jump 2 pins to test the fuel pump. I went to look it up for you which pins they are but startekinfo is down for maintenance..............................

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88 W124 3.0
96 R129 119eng
06 ML350
98 ML320 sold
02 CLK55 amg