Question about Craftsman 20 hp 42 in. Deck Yard Tractor

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After about 30 minutes engine will start surging, by partly pulling the choke out it will run better. The carb has been recently rebuilt as well as new filter and fuel line to carb. Tried different fuel cap as well. My next idea is to replace or clean gas tank and replace fuel line to fuel filter. This a 20hp.42inch briggs engine. The tractor seams to run fine right up to the 30min. time. Is there anything else I should look at or am I on the right track with the gas tank.

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Typically a surge is caused by a lean condition. I'd say the float is set to low and this is causing the engine to lean out & when you apply the choke it richens it back up.and the surge stops.

Posted on Oct 23, 2010

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