There was an irritating smell of petrol coming inside the car cabin, when car was pushed to its limits. After detailed inspection, petrol was found in air cannisters gas line. So it was taken out and cleaned. After that I pushed the car quite hard revving upto 4000rpm. No smell was observed after that. So, am hoping the issue has been resolved. It happened coz we filled petrol beyond AutoCut, which caused petrol to enter into AirCannisters gas line. Hence the problem.