Originally Posted by ZZ71

While you might have put in fresh gas in tank, problem might be between tank the engine. Carb or injectors gumed up.

Any fuel containing ethanol can cause problems when not used up quickly. Ethanol is hygroscopic, which means it has a tendency to absorb water. When ethanol absorbs water, it readily separates from gasoline and, because it is heavier, falls to the bottom of the tank. The ethanol/water mixture in the bottom of the tank degrades relatively quickly.

When a mixture of water and ethanol degrades and creates gums, varnish and other insoluble debris, fuel flow passages can become narrow or plug, significantly affecting engine performance.