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To change the fuel filter on a 2004 Mercury Mountaineer V8 AWD, first ensure the vehicle is off and relieve fuel system pressure by removing the fuel pump relay and starting the engine until it stalls. Locate the fuel filter, which is typically found along the frame rail, and disconnect the fuel lines using a line disconnect tool. Remove the old filter and install the new one, ensuring the flow direction matches the markings on the filter. Reconnect the fuel lines, reinstall the fuel pump relay, and start the engine to check for leaks.

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2mo ago

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