CNG (Compressed Natural Gas) vehicles are known for being cost-effective, eco-friendly, and ideal for urban driving. However, like any fuel system, they require specific maintenance to ensure optimal performance and safety.
In this guide, we’ll share the best practices for maintaining your CNG car so you can enjoy lower fuel costs, longer engine life, and safer rides—whether you own a hatchback, sedan, or fleet vehicle in India.
🛠️ 1. Regular CNG Kit Inspection
The CNG kit is the heart of your vehicle’s dual-fuel system. Whether factory-fitted or aftermarket, it needs routine inspection to detect leaks, pressure issues, or regulator wear.
Checklist:
- Inspect all hoses, joints, and valves for cracks or leaks
- Ensure the pressure regulator is functioning correctly
- Clean the injectors and solenoid valves as per service intervals
Expert Tip: Always have inspections done at an authorized CNG service center—never DIY.
🔄 2. Follow a Strict Service Schedule
While CNG is a cleaner-burning fuel, it can cause valve wear and injector deposits over time.
Key Service Points:
- Change spark plugs every 15,000–20,000 km (use CNG-compatible plugs)
- Replace air filters and CNG filters regularly
- Get throttle body cleaning done at least once a year
- Check engine timing and tuning for dual-fuel calibration
🧑🔧 Stick to the manufacturer’s recommended service intervals—especially for CNG parts.
💨 3. Get Cylinder Hydro-Testing Every 3 Years
As per Indian safety regulations, CNG cylinders must undergo hydro-testing every 36 months.
Why it’s important:
- Tests for cylinder strength and leakage risk
- Mandatory for insurance renewal and PUC certificate
- Required to legally refill at CNG stations
📅 Keep the hydro-test certificate in your car at all times.
⛽ 4. Avoid Overfilling at CNG Pumps
Many users think “topping off” will get them more mileage. In reality, overfilling your cylinder is dangerous and can cause:
- Pressure buildup and leaks
- Regulator malfunctions
- Early wear on internal components
🛑 Stop refueling when the pump’s auto-cut feature activates.
🔌 5. Switch Between Petrol and CNG Modes Regularly
Running only on CNG can dry out engine valves over time. It’s a good idea to start your car in petrol mode, especially in cold weather.
Best Practices:
- Start the car on petrol and switch to CNG after 1–2 minutes
- Run on petrol for 10–15 km per week to keep injectors and pump active
- Always keep at least 2–3 liters of petrol in the tank
🛞 This ensures smoother performance and longer engine life.
🔋 6. Monitor Performance and Fuel Efficiency
If your car feels sluggish, misfires, or the mileage drops suddenly, it could signal:
- Clogged injectors
- Faulty lambda sensor
- Worn-out spark plugs
- CNG pressure regulator issues
📈 Track mileage (km/kg) regularly and act early on unusual behavior.
🔧 7. Check for CNG Leaks (Smell Test)
CNG has a strong “rotten egg” smell added to detect leaks.
If you smell gas:
- Switch off the engine immediately
- Open windows and move away from the vehicle
- Never use a lighter or electrical device nearby
- Call a professional technician or emergency number
🚨 Safety first—do not ignore gas odor inside the car.
🧽 8. Keep the CNG Cylinder Area Clean and Dry
Since the cylinder is often placed in the boot, it can accumulate moisture or dirt. This may cause:
- Rust on the cylinder shell
- Reduced ventilation
- Electrical short circuits (if wiring is exposed)
🧼 Clean the boot area regularly and avoid keeping wet luggage near the cylinder.
📍 9. Locate Authorized CNG Pumps for Refueling
Avoid unlicensed or roadside vendors for cheap refills—they may overpressurize or tamper with fittings.
Use our CNG Station Locator to:
- Find verified and safe CNG pumps near you
- Check real-time fuel prices in your city
- Read reviews and ratings by fellow drivers
🛣️ A safe refill is the first step toward safe driving.
🔚 Conclusion
CNG vehicles are an excellent choice for cost-conscious, eco-minded drivers in India. But proper maintenance is crucial to ensure safety, performance, and long-term savings.
By following these best practices:
- You’ll avoid expensive repairs
- Improve fuel efficiency
- Extend the life of your CNG system and engine
Make CNG ownership stress-free by staying informed and proactive.