None of the in-game vehicles have fuel tank flap. It seems to be pretty funny for me considering how many details BeamNG cars have. But I understand why devs didn't add them - it would require to add the filler necks and other unimportant stuff.
Please note, that the discussion this is from was about something quite different and my words might appear out of context here. The reason for not having fuel caps is easy, it allows us to use mirrored UV maps.
Thank you for responding! And I guess this fits the game even better - usually, you don't need to refill the fuel tank because the cars get destroyed much earlier than you waste all the fuel
Haha... I didn't know that! That's pretty smart. I just remembered that you said it and was making him aware that you knew that there were no fuel doors
I wonder if fuel cap could be it's own uv map, then mirrored uv maps would still work and fake fuel cap could be hovering ridiculously on surface of the vehicle. When body deforms it would then act nothing like real thing, everybody probably would be happy with that