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Which among the following is not a component of the common rail fuel injection system?

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Which among the following is not a component of the common rail fuel injection system?

(a) ECU

(b) Injector

(c) Spark plug

(d) Electric fuel pump

I had been asked this question during an interview.

This interesting question is from Modern Common Rail Fuel Injection System topic in division Diesel Engine Fuel Supply System of Automotive Engine Design

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The correct option is (c) Spark plug

Easy explanation: The ECU takes the reading from the sensor based on the reading the ECU controls the fuel delivery from the electric fuel pump with prefilter and send the fuel to the high-pressure pump with a pressure regulator valve and then fuel is sent to the common rail than with the injector the fuel is injected.

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