Fuel Leak

Fuel leaks can occur when the engine is cold due to loose hose clamps and other seals contracting and as they warm up, they seal properly. You will want to get this looked at today by a shop, you don't want to wait on this. You may need to leave this overnight so they can try to verify this. When you take the car in, give them as much info as possible, when did it start? Any work recently performed? Warning lights on? Last time you filled the fuel tank? etc.