To tell you the truth i wouldnt even worry about it as long as you going to be driving it tommorow then you'll be fine. I have left fuel in my tamk for 2 weeks and went out and it ran fine and the engine is on it's 7th gallon and it still runs fine and has a ton of compression. If your really worried about it i would just diconuct the fuel line and put some after run inthe carb and turn the engine over all you be fine.