Most MB fuel pumps have a good life cycle. The only issues have been early MLs where there was a rash of fuel pump failure problems (of course in addition to other issues) they went as far as blaming certain brands of gas
I do respect your opinion, are you experiencing a fuel delivery issue?
I am not too confidedant about all applications, but a typical mb system pressurizes the fuel rail, and then shuts off very quickly, if it does not notice flow. There is a regulator that bleeds excess fuel back to the tank, I dont think the extra pressure will enhance performance and might cause injectors to bleed.
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