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Common Rail Diesel

The 'rail' refers to a pipe delivering fuel to the engine.

The fuel in the single pipe (or rail) is under pressure from a pump. Branching off the pipe are injectors, one for each cylinder. The injectors are controlled by electric solenoids, which allow fuel into the cylinder when fired by the Electronic control unit, (ECU).

CRD distinguishes the system from older, mechanical systems, where there were individual pipes to each injector and separate mechanical pumps, operated mechanically from the camshaft.

CRD indicates that it is electronically controlled, for better efficiency and lower pollution.

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