Engine Engine issue

Hi, I have an old sears, 18 hp lawn tractor. Was going fine, shut it off and a few mins. later started it up. Went 10 feet and it stopped. It starts, but when you let the clutch out it stops, even in neutral; like the seat does when you get off. Does it have another cutoff that is connected to the clutch? Anyone know about this? Thanks, frank

Engine Engine issue