I had this happen too. Start by tracing the fuel line from the tank to the engine looking for any leaks. More likely, your fuel pump seal has popped off the gas tank. Mine smelled like someone left a gas can open in the backseat.
Unfortunately, there isn't a hatch under the backseat for access. You'll need to drop the tank to inspect. Smart to wait until you're low on fuel (ask me how I know). Put a piece of plywood on your floorjack to support the tank. Undo the 4 bolts holding it on and lower to the ground. You'll see if the top is popped off. I didn't need any special parts to fix, but I believe the seal can possibly be broken and need replacing? Good luck- you'll enjoy the fresh air smell afterward.