Practice question
When servicing the fuel system on a school bus diesel, cleanliness is critical because:
- Dirt makes the engine sound better
- Clean fuel systems are only a cosmetic concern
- Contamination improves injector spray
- Even small contaminants can damage the precise, high-pressure injection components and cause failures
Answer: D — Even small contaminants can damage the precise, high-pressure injection components and cause failures
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Practice more: ASE S2 Diesel Engines (School Bus) Practice Questions - ASE S2 - Diesel Engines (School Bus) Certification Exam →