I have a small John Deere riding mower. It runs great for about fifteen minutes and stops. after about half hour it will start up and run for a little while. It will run on starting fluid, so it has to be a fuel problem. Can you help me?

I am not good on the computer.. I had another problem with my mower.. You answered the first one about the clutch.. I tried to write to you and thank you, But I guess I didn't do it right. I did solve the running problem.. It was a dirty strainer... Thanks for your interest.... Bobby