2002 df 140

[hopefrog]

Won't restart after it has been ran for 45 minute to hour after it sets for 15 minutes. It looses sparks. Runs great otherwise. It has taken over night to restart. I have completely serviced it. Dealer diagnosed neutral safety switch and replaced it. Nothing has made a difference. Any ideas?

[aquamort]

On that info it sounds heat related? Coil?

[Grumpy56]

Are you sure it is losing spark? I believe these engines are know to have issues with vapor lock. Basically from what I read, it happens after running for awhile and then sitting on really hot days. (Basically the fuel in the fuel lines boils). One fix is an external low pressure electrical fuel pump, 3 - 4 PSI. I believe you can also get around it my pumping the fuel bulb when first starting it up when it is hot. Once it gets cooler fuel, it runs fine.

Might not be your issue, but wanted to throw it out there.

Craig

[redlowrey]

Won't restart after it has been ran for 45 minute to hour after it sets for 15 minutes. It looses sparks. Runs great otherwise. It has taken over night to restart. I have completely serviced it. Dealer diagnosed neutral safety switch and replaced it. Nothing has made a difference. Any ideas?

Need more information, why did the dealer change the neutral switch, it has nothing to do with spark. How did you check for spark.