Heavy Duty Equipment Technician Red Seal Exam Prep · Question
Before starting a diesel engine after a major fuel system repair, why is it often necessary to prime the fuel system?
Air in the fuel system can prevent the engine from starting or cause it to run poorly. Priming removes this air, ensuring a continuous, air-free fuel supply to
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Question: Before starting a diesel engine after a major fuel system repair, why is it often necessary to prime the fuel system?
Answer options: ✅ To remove air from the fuel lines and injectors
- To increase fuel pressure to the maximum operating limit
- To pre-heat the fuel for easier starting
- To lubricate the fuel pump assembly
Correct answer: To remove air from the fuel lines and injectors
Explanation: Air in the fuel system can prevent the engine from starting or cause it to run poorly. Priming removes this air, ensuring a continuous, air-free fuel supply to the injection system.
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