Several JL Rubi owners, including me, have had to have the gas tank, fuel pump and evaporation canister replaced. The breather tube that allows air to fill the tank as gas is used was not extended out of the tank during assembly. The service department found my tube lying in the bottom of the tank. The tube outlet on the top of the tank was thus open. If you overfilled the tank by holding the gas pump faucet, gas could splash out of the tank. Several other Rubi owners also had the same problem. My Rubi was towed to the dealer to see why gas as coming out. While the Jeep was being unloaded, the front end was raised and several gallons of gas poured onto the service garage floor.
Jeep did replace the tank and pump under warranty.
So if you want to check your new Jeep...fill the tank as far as it will go. Lift the front end at a fairly steep angle and see if gas pours onto the ground.
I was lucky...my Rubi only had a couple of hundred miles on it, and the major gas dump occurred while the engine was cold from being towed to the dealer.
I could have had a major car fire, if I had filled the tank and then driven up a steep incline and gallons of gas had dumped unto the hot exhaust pipe or muffler.