NGVi is now more than natural gas. Welcome to the new Alternative Fuel Vehicle Institute – AFVi!

Vehicle Training Level 2 Level 2: CNG Fuel System Inspector Training

Ensuring integrity of CNG fuel systems is a vital part of NGV safety.

While the National Highway Traffic Safety Administration (NHTSA) requires all on-board CNG storage cylinders to be visually inspected at specific intervals depending on gross vehicle weight rating or following any accident or fire, NGV industry best practice calls for inspection of the entire CNG fuel system. CNG fuel system inspections must be conducted by well-trained and qualified technicians.

Attending AFVi’s CNG Fuel System Inspector Training:

  1. Helps ensure technicians are adequately trained to properly conduct CNG fuel system inspections according to all current codes and standards.
  2. Helps prepare technicians for the CNG Fuel System Inspector Certification Exam.

The on-demand e-learning version of this training takes approximately 7 hours to complete.

CNG Fuel System Inspector Certification Exam

Want maximum protection? AFVi’s CNG Fuel System Inspector Certification Exam delivers a rigorous, independent assessment of the knowledge, competency, and application of skills necessary for technicians to properly conduct CNG fuel system inspections, according to all applicable codes, standards, and industry best practices.

AFVi’s certification exam can be taken in conjunction with any CNG Fuel System Inspector Training course.


Level 1:  NGV Essentials and Safety Practices

Select a Course

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Who Is Eligible to Attend?

Experienced vehicle technicians employed by fleets or dealerships who are:

  • Responsible for performing CNG fuel system inspections; or
  • Preparing to take the CNG Fuel System Inspector Certification exam; or
  • Planning to renew their CNG Fuel System Inspector Certification; or
  • Seeking to refresh knowledge on CNG fuel system inspections.

Fleet managers and supervisors, safety managers and risk management staff are welcome to contact us to discuss available training options.

Course Objectives

  • Explain the properties and characteristics of natural gas
  • Distinguish between the four types of CNG cylinders
  • Identify the causes of cylinder failure
  • Name all codes and standards that apply to CNG cylinders and other fuel system components
  • Recognize all major low- and high-pressure CNG fuel system components; describe their function
  • Assess CNG cylinder and fuel system installations
  • Interpret all information from a CNG cylinder label
  • Implement the steps to safely perform a CNG fuel system inspection in conformance with established standards
  • Determine the final disposition process for CNG cylinders and fuel system components
  • List the defueling options for CNG powered vehicles

Course Outline

Module 1 Introduction
Module 2 Properties and Safe Handling of Natural Gas
Module 3 NGV Codes and Standards (Overview)
Module 4 CNG Fuel System Components
Module 5 How to Inspect the Fuel Receptacle
Module 6 How to Inspect the Secondary Check Valve
Module 7 How to Inspect the Defueling System
Module 8 How to Inspect Cylinders and Shields
Module 9 How to Inspect Cylinder Valves, PRDs, and Vent Lines
Module 10 How to Inspect the Fuel System Isolation Valve
Module 11 How to Inspect the High-Pressure Coalescing Filter
Module 12 How to Inspect the Automatic Shutoff Solenoid Valve
Module 13 How to Inspect the Pressure Gauge
Module 14 How to Inspect the Pressure Regulator
Module 15 How to Inspect Fuel Lines
Module 16 Labeling (Other than Cylinder Labeling)
Module 17 Fuel System Final Disposition and Cylinder Disposal
Module 18 Safe Defueling Methods
Module 19 Cylinder Inspection Workshop

Educators/Trainers/Field Service Representatives

Instructional staff members of colleges, universities, private training organizations, fleets, dealers or manufacturers, and field service representatives or other employees with customer training responsibilities are not candidates for this course. Other courses or options may be available. For more information, contact us at 800-510-6484.