I am using Pyandons mods without high-tech. In this case, you can acquire vacuum only with Diamond Technology, but to get there you need a rubber. And to get a rubber you need a vacuum. Can you move recipe of a vacuum to more earlier tech stages?

This two rows made this problem in updates\pyfusionenergy-updates.lua:

RECIPE("carbon-black"):add_ingredient({type = "fluid", name = "vacuum", amount = 100})
RECIPE("carbon-black-2"):add_ingredient({type = "fluid", name = "vacuum", amount = 100})

And in Pyfusionenergy we have:

TECHNOLOGY {
type = "technology",
name = "diamond-mining",
icon = "pyfusionenergy/graphics/technology/diamond-mining.png",
icon_size = 128,
order = "c-a",
prerequisites = {"excavation-2"},
effects = {
{
type = "unlock-recipe",
recipe = "vacuum"
}

Diamond mining is far far after our must-have situation with black-carbon/rubber

So the problem arises when I am using Fyfusion Energy + Py Petroleum Handling without Py High tech.
I just deleted two rows above to continue playing.

Thank you..it will be fixed in the next release.