Like the 300E the fuel pump relay is in the area of the right side hood hinge, behind the battery and posibly behind a thin plastic barrier (which must be removed). It sits next to the Klima relay which is identical in shape. The FP relay will have an rpm writen on it and it won't say klima.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician