Petroleum generators refuse to work when 2 liquids are inside

"Mixed input" situations for the petrol generator would make it fail in prior versions too. I guess it is supposed to burn either Petrol or Ethanol, not a mix of the two.

In the prior versions, I'd simply run the generator until it burned off what it could of the fuel I switched away from. Then I would connect the fuel I'm switching to. Normally that method would work without issue, but in the beta version they have out, even that methodology fails. Only by tearing down and rebuilding the plant was I able to resume power generation at that location.

The plant has always left some fractional amount of fuel behind. It just now seems that the fractional amount of fuel can (at least some times) be enough to prevent the plant from operating again should you switch fuel types.