My 1999 ML430 has a gas leak. Fuel lines under back seat is dry. on 1999 Mercedes-Benz ML430

We took out the rear seat in hopes that a fuel line might have rubbed and gotten a hole. That area is all dry. Where else can we look for the leak. The leak only happens when the car is on. We smell the gas inside and outside the car.

Asked by for the 1999 Mercedes-Benz ML430