A new carb won't cure the problem. I'm in the process of washing the tank out. I think I have it . . . I'm going to run one more gallon of fresh gas through it this afternoon and see if it comes out clean. I think it will, I've been pouring sea foam and gas, letting it sit for a day or two and pumping it out. The last gallon looked decent, but still had a little "chocolate milk" looking stuff in it. If it doesn't come out clean this time, I guess I'll have to pull the engine and take the tank out and clean it.