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Which outcome is most likely when a common-rail diesel engine experiences fuel injector back-leakage?

A)Reduced injection and engine misfire
B)Increased exhaust temperature and soot
C)Elevated fuel pressure and rail failure
D)Decreased fuel consumption and efficiency

💡 Explanation

When a fuel injector experiences back-leakage, the pressure in the common rail drops more than intended because fuel is diverted away instead of being injected, leading to reduced injected fuel and misfire. Therefore, reduced injection results rather than increased temperature, overpressure, or increased efficiency which require other system malfunctions.

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