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My gas 424 has all symptons of vapor lock. Once it gets hot won't run over 20 minutes without dying like you turned key off. Using top grade fuel, insulated fuel lines and carb bowl. Ignition parts all new that might be related. Starts fine once cool, but goes down again once hot. Really bad when putting under a load and governor kicks in. Engine stumbles and will only run if you put throttle to just enough to keep it running. Any thoughts? thanks
 

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check gas tank for partially obstructed flow from tank to fuel bowl. If it is obstructed it will make the tractor act like vapor lock
 
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