I've been trying to figure this out and struggling with it. I've got some fuels I'd like to add to the liquid compressor and I know in 1.12 this was possible with crafttweaker. However, we're using kubejs in 1.16 and I'm just not finding what I need for it to make sense. Is there data pack support for these? Or would I need to go about it differently?

OK, build 88 turns all hard-coded fuel values into datapack recipes. Take a look at https://github.com/TeamPneumatic/pnc-repressurized/tree/1.16.4/src/generated/resources/data/pneumaticcraft/recipes/pneumaticcraft_fuels/ for the default values. All of the default recipes use fluid tags, but you can also use literal fluid names if you want (use "fluid": "xxx" instead of "tag": "xxx"). Also the "amount" field is ignored, and you can omit it if you want.

Awesome stuff! I'll give this a peak tonight. Thanks so much :-D

Yep, Working perfectly, as usual :)

Also really love what you did with the GUI here to differentiate the fluids with identical tags.

Fixed in 2.8.0 release

Hmm, it's probably not possible to do without Java code at the moment. I'd like to get this working with kubejs though, so if I can figure out how to support it, I'll definitely get that in.

The simplest method is data packs. It'll inject them in the absence of more direct api support, and really covers most use cases.