There are 2 pumps and they are under the back seat
see link below
no
Mine went out and was replaced once. Mercedes told me it is inside the fuel tank. The fuel is designed to keep it cool, so never let the fuel level fall below 1/4 tank.
The fuel pump relay on a 2001 Mercedes C320 is typically located in the fuse box, which is found in the engine compartment. Specifically, you can find it in the relay section of the fuse box, often labeled for easy identification. If you're having difficulty locating it, consult the vehicle's owner's manual for a diagram and specific location details.
50 to 55 psi
Under the back seat driver side ... Located in fuel tank.
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the fuel pump relay on the Mercedes E320 in underneth the car itself.