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Where is the fuel pump relay located on a 1990 Mercedes Benz 300e?

The fuel pump relay on a 1990 Mercedes Benz 300E is located in the engine compartment, on the passenger side. It is mounted on the firewall, near the brake booster. The relay is a small, black box with a red or blue cap. It has four terminals, two of which are connected to the fuel pump and two of which are connected to the power supply.
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