So apparently at Home Depot in my area, pre-mixed 2 cycle fuel is in a grey bottle and 4 cycle is in a green bottle. And at Lowe's, it's exactly the opposite. The last time I bought fuel, I bought at the other store and picked based solely on color. This means I have now run about 48 ounces of 4 cycle fuel through the engine of my 2 cycle string trimmer. I know, stupid me for not reading the label.
As I was using it today, it would stop running if I let it idle. I thought that was weird but pressed on. Eventually it died while I was using it at full throttle. I have not been able to restart it at any choke position. It's currently cooling down in the garage.
Have I done permanent damage to the engine? What should I do?