Model #917387300 CRAFTSMAN Walk Behind Lawnmower, Gas

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I have a craftsman lawn mower model # 917387300. It starts right up but turns itself off after about 5 or 10 minutes. When it cools off again, it starts right


I think the gas cap on the engine is not venting. The gas cap should let air into the fuel tank to fill the space that occurs as the fuel is burned. If air is not let into the tank in sufficient volume to keep the tank filled with fuel and air, the fuel tank goes into a vacuum inside. When this vacuum occurs fuel stops flowing out of the fuel tank and the engine dies.

The engine will not start until the fuel cap has vented enough air into the tank to break the vacuum.

You can test the fuel cap the next time the engine dies, by removing the gas cap and putting it back on. If the engine starts back up, the fuel cap is bad.

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Jimmy K -
Sears Technician
July 01, 2010

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