Practice question

A school bus diesel fuel pressure relief/regulator valve in the rail is stuck open. The MOST likely symptom is:

  1. Excessively high rail pressure and overfueling
  2. Higher coolant level
  3. Lower oil temperature
  4. Low rail pressure, hard starting, and low power because fuel is bled back to the tank prematurely

Answer: D — Low rail pressure, hard starting, and low power because fuel is bled back to the tank prematurely

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Practice more: ASE S2 Diesel Engines (School Bus) Practice Questions - ASE S2 - Diesel Engines (School Bus) Certification Exam →