Answer :
Final answer:
The common rail in a fuel injection system serves the purpose of delivering high-pressure fuel to the injectors, contributing to increased engine efficiency.
Explanation:
The purpose of the common rail in a common rail fuel injection system is to deliver high-pressure fuel to the injectors. This pressurized fuel supply helps in improved fuel atomization in the combustion chamber, leading to increased engine efficiency and performance. Contrary to options a), b) and c), the common rail is not used for fuel storage, pressure regulation, or returning unused fuel to the tank.
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