10 years old and I'd be cautious. I've dealt with 10 year old gas and it was a full tank pull, carb rebuild, and a mess. You definitely do not want solids reaching the injectors.
If it were me, I'd sniff to see if it smells like fuel, crank it to see if it fires, and if it does, full tank with a conditioner and run it carefully for a few hours. If it doesn't smell like fuel, I'd take a different approach - drain everything I could, including fuel lines, pump, fuel rail. Drain the tank, and use something like a solvent fed to the pump or compressed air (set to low psi) just to get old stuff out.
Not sure how to get rid of the wasted fuel, though.?