Which outcome occurs when diesel fuel contains excessive water content in a high-pressure common rail injection system?

💡 Explanation

When water is present in diesel fuel, flash vaporization occurs in the high-pressure injector, because the water's lower boiling point allows its rapid phase change and formation of vapor bubbles which then collapse, causing cavitation erosion on the injector nozzle. Therefore, nozzle pitting results, rather than lean combustion, catalyst failure, or pre-ignition which involve chemically-driven events and spark timing issues.

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