I believe there is a leak in the connection between the fuel line and the gas tank. It leaks a lot while the car is running.
Your fuel tank is comprised of plastic lines and components. There is likely a crack in one of the lines or in the fuel pump. You need to have it inspected further to determine the cause. If you would like help with this, a certified mechanic from YourMechanic can come visit your home or office to diagnose and repair the fuel leak.