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This question is kind of vague. Common rail diesel fuel systems are electronically controlled. A common rail fuel system has a high pressure pump that supplies the fuel at very high pressure to a single or common volume that all of the injectors are connected to. The injectors are then electronically signaled to operate, and draw their pressurized fuel from the common rail. The amount of fuel delivered is controlled by the injector. This system is somewhat similar to your port injection gasoline engine, but at much higher pressures. An electronically controled diesel that isn't common rail will have an injection pump that supplies high pressure fuel to each injector individually. The amount of fuel delivered is controlled electronically by the high pressure injector pump.

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Q: What are the constructional differences between an electronically controlled diesel system and a common rail diesel fuel system?
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