C-12 race fuel storage and use

I have a 45gal drum of fuel in my garden shed that is probably 4 years old and I would like to know if I should use it and how to safely open it?There is app. 10 gallons in the drum.

Race gas is usually good for at least a year if it is kept sealed up and stored properly. Four years is pushing it. That gas might still be good for the lawnmower but I don't think I'd trust it in a race car.