sorry, "sticky" is wrong in the context of ethanol gas in a modern-ish tank for a few months. However, when any gasoline is exposed to oxygen it forms solids ca

sorry, "sticky" is wrong in the context of ethanol gas in a modern-ish tank for a few months. However, when any gasoline is exposed to oxygen it forms solids called "gums." My 1971 car has a tank that's vented to the air so it did form a layer of sticky gunk after about 15 years of sitting. Ethanol absorbs water which makes it "not want to burn," corrosive to metal components and it will deteriorate plastics and gaskets. Modern fuel systems are designed with this in mind. But, my '79 Porsche 928 with its mechanical fuel injection (an analog computer that runs on fuel and air pressures) really hates it.