Page 27 - CNG ESP Participant Guide2024

Module 2: High-Pressure CNG Fuel System Components

Module 2: Knowledge Check

If this component of the fuel receptacle is damaged or missing, there will be leaking during the fueling process.
□ Dust cover
□ O-ring
□ Secondary check valve
□ Leak detector

High-pressure fuel lines on CNG vehicles may be:
□ Rigid stainless-steel or approved flexible hose
□ Flexible hose or plastic tubing
□ Plastic tubing or copper tubing
□ None of the above

The fitting most commonly used to connect high-pressure fuel lines in the CNG fuel system is a:
□ Single ferrule fitting.
□ O-ring face seal fitting.
□ Double ferrule fitting.
□ None of the above

Which of the following statements is true about Pressure Relief Devices (PRDs)?
□ PRDs vent gas in the event of a fire.
□ PRD vent lines must have caps.
□ Each cylinder must have at least one PRD.
□ All of the above

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