Practice question
What is the most likely symptom of a failed fuel pressure regulator that is stuck in the fully closed position?
- High fuel pressure at the injector rail, causing a rich running condition and black smoke
- Low fuel pressure at the injector rail, causing the engine to misfire and lean codes
- The fuel tank collapsing due to vacuum pressure
- 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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