Practice question

A school bus diesel exhibits poor fuel economy and low power, but compression and air systems test normal. The technician should next evaluate:

  1. The fuel injection system, including injector return (back-leakage) and rail pressure performance
  2. The cabin HVAC system
  3. The wheel alignment
  4. The brake pad thickness

Answer: A — The fuel injection system, including injector return (back-leakage) and rail pressure performance

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