Practice question

What is the most likely symptom of a failed fuel pressure regulator that is stuck in the fully closed position?

  1. High fuel pressure at the injector rail, causing a rich running condition and black smoke
  2. Low fuel pressure at the injector rail, causing the engine to misfire and lean codes
  3. The fuel tank collapsing due to vacuum pressure
  4. The engine starter motor failing to turn the engine

Answer: A — High fuel pressure at the injector rail, causing a rich running condition and black smoke

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