The fuel pump relay is behind the battery in the area beneath the windshield. There are two large control units KE-Jet and ABS and there are two black boxes a little smaller than a pack of cigarettes. One will say Klima it is the A/C comp control relay. The other one is the fuel pump relay. It usually will have an rpm rating on it and possible say kickdown on it.

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Steve Brotherton
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician