How to make cleaned fuel

First you will need to have filter, that can be crafted with 1 rope, 1 metal scrap and 1 cleaned cloth.

Place them in the crafting workbench and use an Swiss Army Knife to craft one Industrial Filter.

After that you will need to get an empty jerrycan that can be buy to the medical trader in safe-zone.

For the next step you need to fill the jerrycan with Dirty Gas with oil tank, that can be found on the map

and right-click on it to fill 5% by 5%, but don't use it too fast or the oil tank can explode in your face!

Next step you need to find the refinery and place the Dirty Gas into the input block of the refinery.

After you need to activate and selected a good level to keep the Pressure under 200 bars, more the

filter dirtyness and speed is up, more the pressure will go up fast. You need to keep an eye on this two

value else the refinery will explode and won't be usable for 1h30min. If you it good you can get

clean Gas with an empty jerrycan using the output block.

Use the Industrial Filters to keep the filter dirtyness low to prevent breaking the refinery.