CNG Gas Kit Maintenance Tips: Keep Your Vehicle Efficient and Safe14 August 2025

CNG gas kit maintenance tips for better mileage and safety

If you own a car that runs on CNG (Compressed Natural Gas), you’re already saving money and contributing to a cleaner environment. But like any fuel system, a CNG kit needs regular maintenance to stay safe, efficient, and long-lasting.

This guide covers practical CNG kit maintenance tips that will help you avoid common issues, improve performance, and extend the life of your vehicle. These tips are especially useful for Indian driving conditions, and we’ll keep it simple and actionable.

Why CNG Kit Maintenance Matters

CNG is a high-pressure, dry fuel. While it’s cleaner than petrol or diesel, it can put extra stress on certain components of your engine and fuel system. Regular checks and timely replacements help you:

  • Maintain good mileage
  • Avoid performance loss
  • Prevent gas leaks and safety issues
  • Increase the lifespan of your CNG kit and engine

Essential CNG Kit Maintenance Tips

1. Always Start and Stop in Petrol Mode

  • Start your car in petrol mode and switch to CNG after the engine warms up (about 1–2 minutes).
  • Before turning off the engine, switch back to petrol. This keeps your fuel system lubricated and avoids dry starts.

2. Check for Gas Leaks

  • If you smell gas, don’t ignore it.
  • Use a soap water solution to test joints and connections. If bubbles form, there’s a leak.
  • Never use fire or open flames for testing.
  • Always get leaks fixed by a certified technician.

3. Inspect the CNG Cylinder Regularly

  • Get your CNG cylinder hydro-tested every 3 years, as per government rules.
  • Check for signs of rust, dents, or damage, especially if the vehicle has been in an accident.
  • Ensure the cylinder is securely mounted.

4. Clean or Replace the Air Filter Frequently

  • A dirty air filter affects engine performance and fuel efficiency.
  • Clean it every 5,000–6,000 km, and replace it every 10,000 km, especially if you drive in dusty areas.

5. Use CNG-Compatible Spark Plugs

  • CNG burns hotter than petrol, so standard spark plugs wear out faster.
  • Use spark plugs designed for CNG and replace them every 10,000–15,000 km for smooth running and better mileage.

6. Replace CNG Filters on Time

  • The high-pressure (reducer) filter should be replaced every 20,000 km.
  • The low-pressure filter should be changed around 40,000 km.
  • Clogged filters can cause reduced power, poor acceleration, and injector damage.

7. Clean the Throttle Body

  • The throttle body controls airflow to your engine. Carbon buildup can affect pickup and mileage.
  • Clean it every 10,000 km, especially if you’re seeing irregular RPM or poor acceleration.

8. Refuel Only at Authorized CNG Stations

  • Always refill at reputed, authorized stations. Low-quality gas can contain impurities that damage the injectors and regulators.

9. Avoid Overfilling the CNG Tank

  • Don’t top off the tank after the auto-stop. Overfilling increases pressure and can wear out components faster.

10. Park in the Shade When Possible

  • In hot climates, CNG expands inside the tank.
  • Parking under shade reduces unnecessary pressure buildup and helps maintain gas density.

Signs Your CNG Kit Needs Attention

Watch out for these early warning signs:

  • Drop in mileage
  • Reduced power or pickup
  • Strong smell of gas
  • High engine temperature
  • Engine misfire or rough idling
  • Difficulty switching between petrol and CNG

If you notice any of these, get your vehicle inspected at an authorized CNG service center.

Recommended Service Schedule for CNG Vehicles

Component Action Interval
Air Filter Clean/Replace 5,000–10,000 km
Spark Plugs Replace 10,000–15,000 km
CNG High-Pressure Filter Replace 20,000 km
CNG Low-Pressure Filter Replace 40,000 km
Throttle Body Clean 10,000 km
Cylinder Hydro Testing Mandatory Check Every 3 years

Bonus Tip: Use “Auto Mode” If Available

Many modern CNG systems come with Auto Mode that automatically switches between petrol and CNG. Use this feature, it helps maintain engine health by managing fuel transitions smartly.

Final Thoughts on CNG Kit Maintenance Tips

CNG is one of the most efficient and eco-friendly fuel options available, but it needs proper care. By following these CNG kit maintenance tips, you can avoid costly repairs, enjoy smoother performance, and keep your vehicle safe for years.

At MIJO Auto Gas, we manufacture advanced, certified CNG kits built for Indian roads and conditions. If you’re planning to install a new kit or need expert servicing, our authorized network is here to help.

Need Help with Your CNG Kit?

Looking to install best cng kit for cars? Connect with MIJO’s support team or visit your nearest MIJO-authorized dealer. As the best CNG kit company in India, MIJO Auto Gas delivers high-quality, certified systems trusted by vehicle owners across the country. From installations to inspections, we’re here to keep your ride safe and efficient.

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