Hi there! Create has such an incredible focus on automation, it seems like this would be in line with the mod!

I think you should be able to use Create Spouts to spout water/lava into a Filling/Fuel tank to automatically fill it.

This would allow for a few great use cases, primarily allowing you to have a fuel depot where you can drop off your empty tanks, pick up some full ones, and fly away! It would also help with the mod's "feel" when progressing towards end-game with the tools and equipment you have available.