under the rear seat try the fuel pump relay first, in the boot in the fuse fuse box top one or first one
http://www.installuniversity.com/mb/w203/w203/fp.html
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Fuel pump is under right rear of body
tomorow i give you a picture with the fuel pump
Yes
the fuel pump relay on the Mercedes E320 in underneth the car itself.
Mounted on top and inside the fuel tank.
There are two fuel pumps in a Mercedes 300E
The fuel pump relay on a 1988 Mercedes-Benz 300E is located on the passenger side, near the firewall, by the battery. Mercedes-Benz was founded in 1926.
The fuel pump is in the fuel tank and the fuel tank will have to be removed to access it. If you do not have the skill or equipment to do this properly, I suggest taking it to a shop.