O.F. I have mixed up fuel containers before. Was that actually weed killer you put in the plane tank? That would be some real toxic exaust I would think. I sure would not want to breath it.
When I was in teens poured the wrong container into a roto tiller Filled the tiller with 15% nitro fuel. It went like a bat out of h*ll. It had 2 foot of flame coming out of the muffler. real fast idle and the top end was insane. Don't know why it did not throw the rod.
Never made that mistake again
Ken