Where is the fuel pressure regulator on a Mercedes 420 sel 1987?

On a 1987 Mercedes 420 SEL, the fuel pressure regulator is located on the fuel rail, which is situated on the engine's intake manifold. It is typically mounted near the fuel injectors, allowing it to regulate the pressure of the fuel delivered to the injectors. You may need to remove some engine covers or components for easier access. Always consult the vehicle's service manual for specific details and procedures.