Lawn Mower Carburetor Leaks Gas

June 15, 2010

A toro grass recycler mower.My 17 hp Briggs and Stratton lawn tractor floods upon initial startup. The gas will gush from the top of the carburetor. I have to blow out with shop air to get started. Once you get it going, it will run good rest of day.


By CJ Santee


June 17, 20100 found this helpful
Best Answer

Could be the float or the needle that allows the fuel to come down is stuck open. Sometimes the float has a pin hole leak and it fills up inside with gas and opens the needle which allows all the fuel to come in the carb. The seat if it's worn down or dirty will not allow the fuel to shut off so it continues to flow.

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4 More Questions

Ask a QuestionHere are the questions asked by community members. Read on to see the answers provided by the ThriftyFun community or ask a new question.

March 1, 2014

Can a person replace the rubber "o" ring where the float valve goes in to shut off gas flow?

By Clifford

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January 26, 2012

I have John Deere lawn tractor that has a 16 hp V-Twin engine. It has a manual choke. When I crank the mower, the mower runs fine, but gas sprays from the choke side of the carb. I have replaced the needle, cleaned the carb, but it still has the problem. The float is OK. Does any one have any ideas?

By James B

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ThriftyFun is one of the longest running frugal living communities on the Internet. These are archives of older discussions.

June 15, 2010

I have a Craftsman Riding mower LT1000, 42 in. cut, 2007 model. It is leaking gas into the bowl where the carburetor is. The gasket is sealing, it's not leaking out there.

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September 24, 2009

I cleaned the carburetor and reassembled it. Then the mower started and I let it run for about 10 minutes.

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