I can't provide diagrams directly, but I can describe the fuel system of the 1986 Mercedes 420 SEL. The system includes the fuel tank, fuel pump, fuel filter, fuel injectors, and fuel pressure regulator. The fuel pump draws gasoline from the tank and sends it through the filter to the injectors, where it is atomized and delivered to the engine for combustion. For a detailed diagram, consider checking a repair manual or online automotive resources specific to that model.
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