If it was plastic it might have dissolved in E10 or even E5. I have had that problem with my garden power tools.
I live in an area where Ethanol Free fuels ate abundantly available. Can't imagine using E-anything in any of my vehicles.
Can't get anything but E fuel here. E10 or E5. E5 is supposed to be near enough ethanol free in some ares of the UK but I'm not convinced.
I've fitted a stainless tank, and ethanol resistant hose so no concerns and not noticed any issues. I use E10 mostly, with the occasional squirt of E5 when I'm feeling flush.
