Question about Briggs & Stratton Lawn-Boy 10640 20-Inch 6.5 HP Gas Powered Lawn Mower

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How come gas comes out of the air filter when I put gas in it?

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Within the carburetor on your engine, is a float that is attatched to a needle valve with a rubber seat that the needle presses up against. As fuel goes into the carb, the float is lifted and the needle shuts off the fuel flow against the seat. In your carb, either the float is not floating, or the needle is not sealing against the seat. The solution is to either clean and rebuild the carburetor, or replace the carburetor. I also recommend to replace the air filter since it has been gas fouled.
Good luck!

Posted on Sep 09, 2010

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Posted on Jan 02, 2017

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Check carburetor & air filter. Clean off all dirt and clean air filter. check age of gas. Cannot be more than 30 days old. Make sure to use fresh gas w/synthetic 2-cycle oil @ 40:1 ratio (1 gal.) Gas to 3.2 oz. Oil). Do not use old or stale oil/gas mixture. Before putting in fresh fuel, press the primer several times. A small amount of gas might show up in the fuel tank. Remove fuel. With carburetor cleaner, spray carburetor. Put in small amount of fresh fuel. Just enough to cover the fuel filter. Then press primer with fuel cap off, and watch to see if fuel is flowing smoothly. If not or if plastic primer bubble does not come back to original shape after pressing, then you have to take carburetor apart and clean or get new carburetor.

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Check carburetor & air filter. Clean off all dirt and clean air filter. check age of gas. Cannot be more than 30 days old. Make sure to use fresh gas w/synthetic 2-cycle oil @ 40:1 ratio (1 gal.) Gas to 3.2 oz. Oil). Do not use old or stale oil/gas mixture. Before putting in fresh fuel, press the primer several times. A small amount of gas might show up in the fuel tank. Remove fuel. With carburetor cleaner, spray carburetor. Put in small amount of fresh fuel. Just enough to cover the fuel filter. Then press primer with fuel cap off, and watch to see if fuel is flowing smoothly. If not or if plastic primer bubble does not come back to original shape after pressing, then you have to take carburetor apart and clean or get new carburetor.

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In idol, comes extreamly close to dying on me. I have to keep on the gas to keep 'er going. Feels like there isn't enough either fuel or air getting to the engine. I just cleaned the air filter and put...


try changing the spark plugs and wires

oil change

replace the air filter if its the reguler one and not the cleanable ones

put some fuel injector cleaner in the car

these are some options ^-^

i hope this helps

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