I was shown how to remove the Ethanol from petrol on a Buzzing Club run a while back.
Take a quart coke bottle. Drill a hole in the cap that can be covered by a finger then put a cupfull of water in, fill with petrol and agitate.
Invert with finger over hole in cap and wait till the water, now containing the Ethanol, settles out.
Discard by removing the finger then pour the remaining purified petrol into your tank.
A little tedious when filling your old Jag but needs must, as the Sailor said to Fanny Hill.