gas leakage when car's on

Hello, DO NOT drive this vehicle. This gas leak is right around your exhaust pipe, and it gets very hot. I have great concern for your safety, as well as the safety of your passengers and other drivers due to this issue. It is likely that the fuel return line to the fuel tank is damaged, which would be why it is appearing when the engine is at a low demand for fuel. Have this towed to a service center and fixed before driving to avoid an avoidable fire.