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Make sure the little pin hole in the gas cap isn't plugged. When the engine acts like it's running out of gas quickly remove the gas cap. If it runs normal then the gas cap hole is plugged.

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15y ago
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Q: Your 17.5 hp Briggs acts like it's running out of gas after it's run for approx 20 mins you have changed the spark plugs cleaned out the air filter oil level is fine new battery changed fuse?
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