I have an older mule KAF620B. (90's) After you go about an 1/8 to 1/4 mile the mule just quits running. Sometimes you can catch it before it quits by shifting it into N and pulling out the choke and giving it some gas. Mostly it just quits. Usually you can just start it back up and go on your merry way. Other times you have to let it sit for about 5 minutes before you can start it again. Needless to say we don't go far from home because you never know when it will quit. We have a new fuel pump on it. Any suggestions?