Level 2 CNG Fuel System Inspector Training

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Ensuring integrity of CNG fuel systems is a vital part of fleet safety. While the National Highway Traffic Safety Administration (NHTSA) requires all on-board CNG storage cylinders to be visually inspected every three years or 36,000 miles, whichever comes first, 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 NGVi’s CNG Fuel System Inspector Refresher Training accomplishes two goals:

  1. It helps ensure that technicians are adequately trained to properly conduct CNG fuel system inspections according to all current codes and standards.

  2. It helps to prepare technicians for the CNG Fuel System Inspector Certification exam.

CNG Fuel System Inspector Certification Exam

NGVi'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.

To learn more, click here.

Course Details

Course Prerequisites

Delivery Options

Who Should Attend

Course Outline

Course Objectives

Course Prerequisites:

NGV Essentials and Safety Practices is a prerequisite to CNG Fuel System Inspector Training.

Delivery Options:

This course is available either by public enrollment or in-house training.

  • To learn more about the public class schedule and to register click here.
  • For fleets with larger numbers of technicians, NGVi brings their in-house training to your facility and can customize the training to your specific needs. 

Who Should Attend:

  • Technicians responsible for maintaining natural gas vehicles
  • System installers
  • Corporate/agency safety managers
  • Fleet managers and supervisors
  • Risk management staff
  • Technicians preparing to take the CNG Fuel System Certification exam
  • Anyone planning to renew their CNG Fuel System Certification
  • Experienced NGV technicians looking to refresh knowledge on
    CNG fuel system inspections


Instructional staff members of colleges, universities, or similar private training organizations are not candidates to attend our individual classes but have numerous options for bringing NGVi's training classes to their campuses or facilities. For more information, contact us at 800-510-6484.

Course Outline:

Module 1:
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 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


Course Objectives:

  • Describe the properties and characteristics of natural gas.
  • Identify the four types of CNG cylinders, their construction methods, certification requirements, current and past manufacturers.
  • Identify the causes of cylinder failure.
  • Identify all codes and standards that apply to CNG cylinders and other fuel system components.
  • Identify all CNG high-pressure components, and their purpose.
  • Identify and assess CNG cylinder and fuel system installations.
  • Interpret all information from a CNG cylinder label.
  • Describe the steps and methods to safely perform a CNG fuel system inspection in conformance with established standards.
  • Describe the final disposition process for CNG cylinders and fuel system components.
  • Describe the defueling options for CNG powered vehicles.


Click here to learn more about in-house opportunities.

CNG Cylinder Inspection Labels

You can now order the CNG Cylinder Inspection labels online directly from our website. For more information, click here.




Upcoming Training

Level 1: NGV Essentials
and Safety Practices

May 8, 2018
Olathe, KS

Level 2: CNG Fuel System
Inspector Training

May 9-10, 2018
Olathe, KS

Level 1: NGV Essentials
and Safety Practices

June 12, 2018
Minneapolis, MN

Level 2: CNG Fuel System
Inspector Training

June 13-14, 2018
Minneapolis, MN

Essentials of CNG Station Planning,
Design and Construction

September 24-25, 2018
Las Vegas, NV

Essentials of CNG Station
Operation and Maintenance

September 26-27, 2018
Las Vegas, NV


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About NGVi

Natural Gas Vehicle Institute is North America’s leading provider of training and consulting on natural gas as a transportation fuel.

Our services address the full range of natural gas vehicle and fueling issues, including:

Technical consulting services – Sizing and designing compressed natural gas fueling stations, vehicle assessments and technical assistance for fleets, CNG fueling station troubleshooting, natural gas vehicle maintenance facilities upgrades, liquefied natural gas fleet and fueling management.

Technical training – NGV Essentials and Safety Practices, CNG Fuel System Inspector Training, Heavy-Duty NGV Maintenance and Diagnostics Training, Light-Duty NGV Maintenance and Diagnostics Training, CNG Fuel System Design and Installation Training, Essentials of CNG Station Operation and Maintenance Training, Essentials of CNG Station Planning, Design and Construction Training and CNG/LNG Codes and Standards Training for Fire Marshals and Code Officials.


Read more about NGVi »

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