1. Poor maintenance of CNG kits and pipe 2. Gas leakage due to loose valve or damaged pipe 3. Overfilling cylinder beyond pressure limit (200 bar) 4. Parking car in direct sunlight for long hour 5. Expired or old CNG cylinder not replaced on time 6. Using local or unauthorised CNG kit 7. Ignoring regular leak and pressure check 8. Faulty installation or modification in CNG line 9. Excess heat or fire near the cylinder area 10. Not following safety guidelines during refueling