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While other diesel injection systems generate the fuel pressure for each injection separately, the Common Rail System separates pressure generation and injection from one another. The fuel is constantly available at the pressure required for injection.
The Common Rail System is modular in design. The right combination of high-pressure pump, injectors, rail and electronic control unit results in systems for all types of engine. Conventional injection systems can be replaced with the Common Rail System with relatively few changes. The injectors can be fitted in the cylinder head like a nozzle-holder combination, and the high-pressure pump replaces the one previously used.