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Where is the Fuel Pump Relay Located in the Mercedes S-Class?

Model: Mercedes Classe S W221, MK 5 - Years 2005-2013
Part: Fuel pump

If the fuel pump in your Mercedes S-Class has suddenly stopped working and you suspect the relay is faulty, you can find its location in this video. As shown, it is located in the box inside the cabin, behind the panel between the two rear seats, and is labeled "S". You cannot visually check its status like a fuse, but you can measure the voltage at the two terminals with a tester or replace it directly with a part of the same specifications. If it is intact, the issue may be with one of the fuses, which is also indicated in the same video.

Updated on 9 June 2026 by ScegliAuto

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