The fuel pump relay is going to be under the hood of the Mercedes Sprinter. You're going to want to head inside the vehicle and then press the hood release button. Once back outside lift up on the hood and with the other hand undo the safety latch. Now look to the upper right side of the engine compartment near Your battery. The fuse box is going to be here and it'll have a cover on it. Take off the cover and You'll see Your relay on the lower area.
Https://sprinter-source.com/forums/index.php?threads/101915/ It's underneath of Driver seat
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