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← TechnologyWhich risk increases when direct fuel injection system pressure exceeds injector mechanical limits?
A)Hydraulic lock in the cylinder
B)Fuel pump cavitation damage
C)Injector nozzle cracking and leakage✓
D)Increased exhaust particulate emissions
💡 Explanation
When fuel pressure exceeds injector design limits, stress causes the injector nozzle to crack because the material yield strength is exceeded, resulting in fuel leakage. Therefore injector nozzle cracking results, rather than hydraulic lock,pump cavitation or particulate emissions, which involve separate physical failure mechanisms.
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