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To replace the fuel pump on a Mercedes 300D, first, disconnect the battery and relieve fuel system pressure by removing the fuel pump fuse and running the engine until it stalls. Next, access the fuel pump, typically located under the car near the tank, by removing the necessary undercarriage panels or fuel tank shield. Disconnect the fuel lines and electrical connectors, then unbolt the old pump and install the new one, ensuring all connections are secure. Finally, reassemble any removed components, reconnect the battery, and test the system for leaks.

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