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------------------------------------------------ In a common rail fuel system, what is the function of the fuel pressure regulator?

A. To pressurize the fuel for injection
B. To regulate the fuel pressure delivered to the injectors
C. To filter the fuel before it reaches the injectors
D. To return unused fuel to the tank

The fuel pressure regulator in a common rail fuel system is responsible for controlling the fuel pressure that is delivered to the injectors, which helps ensure the engine's efficient operation.

Explanation:

In a common rail fuel system, the function of the fuel pressure regulator is to regulate the fuel pressure delivered to the injectors. This involves managing and controlling the amount of fuel pressure to ensure that each injector receives the appropriate amount of fuel at the right time. By doing so, the regulator contributes to the engine's efficient operation. For example, if too much pressure is applied, it can lead to over fueling and waste of fuel. Conversely, if there is not enough pressure, it could lead to underfunding and poor engine performance. Therefore, the fuel pressure regulator plays a key role in maintaining the balance and ensuring the smooth running of the engine.

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