You don't have to empty the tank, although it will have to be included in your declared liquids. While it's not required to empty the tank, it's advisable to empty it as the pressure on the plane could cause it to leak.
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Flying with vaping devices and batteriesBecause of concerns over fires in the cargo hold, all electronic devices and vape batteries must be carried onto the plane. You can't pack them in checked baggage. This is a worldwide rule, with no exceptions.
You can also take elf bars, geek bars and any other type of disposable vape in your carry-on luggage as long as it adheres to the standard hand luggage regulations. It is important to note that these items are only permitted as hand luggage, and should be stored safely in a sealed bag or container.
Scanners in airports can easily detect vape kits. Be it disposable or otherwise. Hence, you must check with your airlines and follow all the required regulations. Passengers can carry Vapes and E-cigarettes in their carry-on luggage or personal bag but not in the checked luggage.
To pack disposable vapes in your carry-on bag, you need to place them in a single quart-sized zip-top bag along with any other liquid items that you wish to bring in your carry-on bag. You're only permitted one quart-sized bag for the liquid items in your carry-on bag, so choose your items carefully.
Disposable nicotine vapes are allowed on an airplane, but only in carry-on luggage or personal storage—never in checked luggage due to the lithium-ion battery inside. And going through TSA with a disposable vape is fine, as long as you put it in the container with your other devices and items that contain metal.