I have an 07 660 Grizz. During the 6 years I’ve owned it, I’ve never turned the fuel off. I always leave it on and have had zero problems. A friend borrows my machine and I mention that you can leave the fuel on. He drops it off a few days later. I back it off the trailer and start driving up the driveway and it dies. He sez I turned the fuel off so it wouldn’t flood the crankcase. I turn on the fuel and drive it into the garage. The next morning the garage floor is covered in gas. The air filter box is full of gas. I drain the crankcase as its full of gas. I remove the spark plug and pull the starter rope and it blows a bunch of gas out of it. After changing the oil and filter as well as cleaning everything up, its back to running again. Now I’m afraid to leave the fuel on. Any idea what changed with the petcock, why it leaked fuel now and never in the past. Anyone ever have a similar experience?