After replacing the fuel pump relay, power relay and the EFI module I found a harness connector under the dash. The pin inside the connector supplying power to the fuel pump was badly corroded ....... I cut it off and soldered a new pin in place ..........Also replace ALL fuses ..... You should be fine.

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2003 SLK 230 (85000)
1999 E300 Turbo Diesel (388,000)
1991 350SD Turbo Diesel (185,000)