Question about Craftsman 20 hp 42 in. Deck Lawn Tractor - CA Model

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Riding lawn mower keeps flooding

When i try to start my rider gas will spit out of exhaust then flood. can get it to un for 30 seconds then it floods out.spark plug gets gas on it.wait for 25minutes and keeps repeating this.runs then stops.sounds like im getting to much gas

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It sounds like the inlet needle seat is not closing all the way,allowing fuel to overfill the carburetor.The inlet needle seat may have dirt in it.You will have to remove the carburetor bowl and check for dirt or debris in bowl,if so remove the float assembly and check for a peice of dirt between the inlet needle and seat.If there is none you may have to replace the carburetor or rebuild it with a carburetor kit.You should also chang the engine oil because the overfilled carburetor drains to the crankcase,filling it with fuel,check the oil level and see if it is high,that would indicate fuel is in the oil.Hope this helps

Posted on Jul 30, 2009

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It would appear that the fuel float might have a hole in it and is causing too much gas to flow into the fuel bowl at the underside of the carb. You can remove and check for a bad float or check to see if the float is sticking and isn't allowing the needle valve to shut off the fuel supply when the bowl is at the right level. You can check all of this pretty easily, just be sure to shut off the fuel tank and have some rags handy to catch the fuel in the bowl when you remove it. You can use some carb/injector cleaner to remove any residue or deposits (shellac-ing) that may have occurred that is causing this problem

Either that or the fuel adjustment is set too high on the carb, which is letting more gas than needed into the bowl and thus the carb allowing for the excess to blow out the exhaust. Readjust the flow by turning the knob all the way in in the center of fuel bowl and slowing turn it out until the engine runs smoothly.

Posted on Jul 28, 2009

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Could be one of two things your inlet valve is stuck open due too bad gas from being left untreated during the off season. what happens gas being left in during off season gums up needle valve and lets gas continue to pour into the carburetor..Easy solution remove carburetor its a simple job and remove float and valve and clean with carb cleaner.Or second thing would be float has hole in it and causes it to sink when the gas fills the carb causing the valve to stay open...

Posted on Aug 09, 2014

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May 05, 2010 | Craftsman 20 Hp 42" Deck Lawn Tractor

1 Answer

Engine seems to be flooding out. I have spark but if you take the plug out it is soaked with gas.


if it's flooding out try starting it without using the choke. if it still floods then the float in the carb is stuck open and you will need to remove and rebuild the carb. they sell complete carb kits for all makes of engines..good luck

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