[WardL]

Back to the fuel ageing question....When stored under the right conditions (dry, dark and air tight can) fuel will last 3 years. Your Toluene boils at 110 C or 230 F, so not much is going to boil off. If it is hot and the light components of the fuel have evaporated, you will lose octane. The light components are about 90 octane. The engine depends on lighter components to vaporize easily and start. It also depends if it was summer gas or winter gas 3 years ago when you filled the tank. If there is ethanol in the fuel, watch out for the water at the bottom of the tank! A small portion of old fuel in the tank should not be an issue.