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Maybe an electrical problem. The battery might be running down after 20 minutes. Check the charging system.

My fix was easy it was the fuel filter heating up to close to oil filter/heat. this stated happening right after tuneup. I switched the long hose from fuel tank to filter. I put it on the carb side and short hose on the tank buy new filter that one is damaged most likely. look for hard plastic filter but moving it should do the trick either way

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14y ago
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Q: Why does craftsman riding lawn mower die after running for 20 minutes?
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