CDI (Common rail Diesel Injection) is the marketing name given by Mercedes to their modern diesel engines, which are using common rail injection technology. In essence, common rail is a development of the direct injection system. Conventional direct injection diesel engines must build up fuel pressure for each cylinder injection, whereas in CDI (and other common rail systems) the pressure is generated independently of the injection sequence and remains constantly available in the fuel line (on a common rail).
Acting as an accumulator or a separate reservoir, the common rail is usually situated above the cylinders and is distributing the fuel to the injectors and a high and constant pressure. Regulated by the engine ECU, special solenoid valves control the amount of fuel being injected in each cylinder. The biggest advantage of this system is the power and fuel economy induced by the efficiency of common rail over conventional injection systems.

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