CNG Conversion Kit Components | Details with the Installation Process.

CNG conversion kit components and the details of the conversion kit installation are discussed in this article. 

CNG Conversion Kit Components

CNG Conversion Kit Components

All types of vehicles can run on CNG by installing the conversion kit. Kit is assembled of many components required to run existing vehicles on CNG. There are a few basic components that are common in all types of kits, irrespective of the vehicle such as a CNG storage cylinder, high-pressure tube, pressure regulator, pressure gauge, change-over switch, high-pressure tube fittings, refueling receptacle, and air-fuel mixture. Major components of the CNG kit for carburetor-fitted petrol vehicles are illustrated below-

  1. Pressure regulator.
  2. A petrol solenoid valve with a manual override switch stops petrol flow when operating on CNG.
  3. On-Off valve and refueling connecter. Opens and stops gas flow to the regulator and includes a refueling device. 
  4. Control module/change-over switch. Electronic control component with fuel selection switch. 
  5. CNG level Indicator. It shows the CNG quantity on the vehicle dashboard.
  6. Gas-air mixture.
  7. CNG cylinder with valve, vapor bag, and bracket. 
  8. Petrol hose.
  9. Low-pressure gas hose.
  10. Ignition advanced processor.
  11. High-pressure gas tube.
  12. Wire harness.
  13. NRV in the petrol return line. 
  14. Pressure gauge.
There may be some differences in nomenclature and variations in the kit component from one make to another. For more details, the motorist should refer to the conversion manual, packing list, and schematic diagram provided by the supplier at the time of purchase of the kit. 

CNG Kit Installation

Before conversion to CNG, the vehicle must undergo a pre-conversion check. There is to ensure that the engine is mechanically sound and properly turned to the manufactures specifications. The checks should include an audit of the electrical system, ignition, valve clearance, cylinder compressions, exhaust gas analysis, and the condition of the air cleaner. 
It is best to check fuel consumption, power output, and vehicle performance n starting, idling, and running. Fuel emissions should also be checked both before and after the conversion of CNG as well as petrol separately. Sometimes, there can be additional expenses initially for replacing batteries, ignition circuits, etc. This is because the ignition temperature for CNG is much higher than for petrol and a much stronger spark is needed to ignite CNG, even though the earlier spark strength may have been acceptable for petrol running.
Also, ensure the following- 
  1. The workshop is authorized and observes Safety standards and the Code of Practices in kit installation and commissioning. 
  2. The kit, including the cylinder, must be type-approved for the make of the car. Do not buy components from different sources or try to install the kit yourself. 
  3. Before converting the car to CNG, the tubing must be totally free from debris, dust/sand. After the connections are made, ensure a complete and thorough leak test of the gas system. 
  4. Collect the installer’s certificate from the workshop. 
  5. Modification or improvisation should be done at an authorized workshop.  


Cylinders are usually mounted in the luggage space of vehicles. In station wagons and hatchback vehicles, there are mounted behind the rear seat or in some cases underneath the chassis. The cylinder must be located in a protected position to minimize damage in the event of an accident and should not be mounted on the roof unless specific approval is available.
Specifically, designed steel clamps that surround and grip the cylinders are used to mount these on vehicles. These clamps are anchored to the body of the car with suitable stands to facilitate the efficient use of boot space. 


Fitments and the components of the CNG kit required general inspection of the vehicle. It is advisable to check and install the kit under a trained technician. 
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