[TomS]

Is there such an animal for our FFS's???

 

[TomS]

Right, looking for a locking one...

 

[Catfish]

I am not I have seen a locking cap for the current version of the Ford capless fuel fill system.

I did find an interesting note on a website about the pros and cons of the systems.
Car Pro Pros and Cons of Capless Gas Tanks - Car Pro News

It is interesting that it says it is almost impossible to siphon gas from, if that is what you are worried about.
But, I am sure if there is will to do so, there is a way.

 

[Mag17]

Hmm would be nice to know for sure if the new system is syphon proof or not. If not need a cap......

 

[D&D]

I tried to siphon gas out of our Edge with the capless fuel filler and could not get the hose in far enough to get at the fuel. Had to go to the service station to finish cutting the lawn.