@Xulfiqar bhai can you please help or suggest?
my charade is having a very bad fuel average. 5kms/litre in city without AC. Also there is smell of petrol in car whenever i filled the tank, i checked many times under the car if there is any leakage but there is not any sign of petrol leakage, also did the complete carb service from plaza, even my mechanic in unable to diagnose the problem, he is advising to replace the carb with smaller one. I want to use only petrol in my car all the time but cant afford this average 
any piece of help would be appreciated.