Dorsal/War Eagle: the plastic molded tank is ethanol safe isn't it? they don't slosh those tanks with sealer do they?

I'm going to get the plastic float - price is right, and the optical plastic ones even the mfg emailed me and said they don't recommend the plastic for gas only the metal optical sensor. ($195). Too rich for me if that float will slide in the 1/2" thread hole

~Wild