I see that refineries have three separate tanks, so my question is where does oil go in and where the fuel is left? I initially placed the oil in both tanks on the back of the refinery and the fuel came out from the front one. But sometimes when oil supply didnt quite make it to one of the tanks suddenly a tiny bit of fuel would leak to that tank leaving it unoperable to introduce more oil. I'm using tight settings sometimes so changing the output pipe is not an option.
Could someone ellaborate a bit more about them?