I want to share my experience with my tractor that would run for 10 minutes, die, then run for 5 minutes, then die, etc. All my internet research led me to the fuel cut off switch that sits at the bottom of the carb. Ordered it off eBay for $38 since Sears wanted $68 shipped. Went to drain the gas before doing this and removed the fuel line from the fuel filter. The gas wouldn't run. I opened the gas cap, then the gas would run. I closed the gas cap, the fuel would eventually stop. I took off the gas cap and there is a little tiny vent hole in the middle. It was filled with dirt. I took a needle and cleaned out the hole and it worked fine. So if anyone has this problem, check there first. Free and easy fix.