My neighbor has a 2000 John Deere 425 that tends to quit running while mowing. After talking with him this problem has been going on for some time now. It quits running all of a sudden, as if the key is turned off. If the tractor sits for a couple hours it will star right up. The fix in the past has been "it needs a new fuel pump". Three pumps later (over a few seasons) and its still a problem. He has asked me to look at it the next time it does this. My guess is its not the fuel pump but another component is the fuel control system as this seems to be a heat related problem. It has been very hot here lately and it has quit 3 times this past weekend. Anyone with a 425 experience this?