Answer :
Final answer:
The correct option is D) To deliver high-pressure fuel to the injectors. The primary purpose of the fuel rail in a common rail fuel injection system is to deliver high-pressure fuel to the injectors. It does not store excess fuel, return unused fuel, or pressurize fuel, as these tasks are completed by other components of the system.
Explanation:
The fuel rail in a common rail fuel injection system has a major role in pressurizing and delivering fuel. It is essentially a pipe (common rail) that holds the fuel at a high pressure, up to 1,800 bar (26,000 psi), and delivers it to the injectors at the right moment. Option D: 'To deliver high-pressure fuel to the injectors' best describes the function of the fuel rail in a common rail fuel injection system. Neither of the other options precisely describe the purpose of the fuel rail. The fuel rail does not store excess fuel for future use, return unused fuel to the tank, nor does it pressurize the fuel for injection. The pressurizing is done by the fuel pump, and any excess fuel not used by the injectors is generally returned to the fuel tank via a fuel return line, not the fuel rail itself.
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