When Performing a Back Leakage Test on a CR Engine

question 59

Multiple Choice

When performing a back leakage test on a CR engine with CRI2 injectors, excessive fuel flow from the fuel return line was measured from the cylinder head. Which of the following conditions is most likely the cause?

• A)A worn-out high-pressure pump.
• B)A defective fuel control valve.
• C)A leaking quill tube connection.
• D)A defective pressure-protection valve.

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