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In a common rail fuel system, what is the purpose of the fuel rail?

A. To return unused fuel to the tank
B. To store excess fuel for future use
C. To regulate fuel pressure to the injectors
D. To supply high-pressure fuel to the injectors

Answer :

Final answer:

The fuel rail in a common rail fuel system supplies high-pressure fuel to the injectors, serving as a conduit to ensure continuous fuel supply.

Explanation:

In a common rail fuel system, the purpose of the fuel rail is to supply high-pressure fuel to the injectors (d). The fuel rail serves as a conduit or pipeline that sustains and delivers pressurized fuel from the pump to the injectors. Thereby, it ensures a continuous supply of high-pressure fuel directly to each injector, which in turn sprays the fuel into the combustion chamber of the engine for ignition. It does not return unused fuel to the tank (a), store excess fuel for future use (b), or regulate fuel pressure to the injectors (c).

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