Recently got my car's fuel filter replaced. During test drive, without sealing fuel pump, didn't smell anything but started to smell petrol in car on my way home. I don't drive car for work so everyday I started to smell back seats of my car after getting home from work, hoping smell of petrol will disappear by its own. It was reduced by still there. Mentioned this to @capsat and @Xulfiqar who suspected that either my charcoal canister is choked or I should visit mechanic to re-seal the fuel pump. Last night, got into car when I was looking for something and I realized that I was smelling my old fuel filter which I left on my car's back seat after getting my car fixed 
