I believe it is integrated in the K40 relay module in the front right engine compartment next to the ME control unit. I also believe the 97 W210 relay was moved outside of it. That fuel pump should be outside of the tank so it will be easy to test for power and ground at the pump if you are having a fuel related issue. I have replaced many more fuel pumps on these vehicles than relays. I usually replace the relay as a precautionary measure, but not because it failed. I hope this helps you.
SOURCE: On my 1989 Mercedes Benz 300E there are 2 fuel
yes,that original set-up of mb,reason behind that,one pump working 100 percent to attain fuel press.while two pump working only 50 percent each,long use of two pump
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