The fuel oil back pressure regulator on the fuel system shown in the illustration, returns fuel to the __________. Illustration GT-0021
Official USCG Answer & Rule Citation
Correct Answer: Option D — booster pump discharge
The fuel oil back pressure regulator maintains a constant pressure at the fuel control unit by bypassing excess fuel. Returning this fuel to the booster pump discharge ensures a closed-loop system that prevents pressure spikes and maintains the required head pressure for the high-pressure fuel pump inlet.
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