Lawn Mower Overflow

Hi
My gas lawn mower was working fine till last week. I found that it was short of oil, so I added some and was mowed for another couple opf weeks. This week, when I tried to turn it on, there was oil spill below the engine and mower is not turning on. Is this overflow or did I do something really stupid? If it is overflow, please advise how to fix it. Thanks. Tom.
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If oil is pouring out not from a leak, or oil level is up and flows out when you remove the cap to check it, your Float is likely stuck , if that happens gas enters the motor, diluting the oil, ruining the engine. Rebuild carb, or simply put a 1$ inline gas stutoff valve in.
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m Ransley wrote:

What the fffff....? Troll? That makes no sense.
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This a very common problem. When the carburetor fails to stop the gas flow for what ever reason, the gas will run out of the tank, through the top part of the carburetor and seep past the piston and end up in the base. The result is an overflow of oil/gas which is diluted to the point that it does not lubricate any more and the cylinder walls are washed down and the motor will pack it in. Reasons for this could be a stuck float, stuck needle valve, leaky float, dirt under the needle valve, worn needle valve or seat and I could go on and on. The usual fix is a carburetor kit which includes a new needle valve. If the seat is worn a carburetor replacement may be needed. If you don't want to spend the money for a new carburetor, you can install a shut off valve on the gas line for use when the motor is not in use. When it is running the gas is being burned and rarely leaks.

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John Lawrence wrote:

Yep, happened to me on a one year old rider (18 HP Briggs). Fortunately so much gas poured in that it hydro locked and clued me in rather than running with a crankcase of diluted oil. The starter would grunt but couldn't turn it over. Mucho fun draining everything (no convenient gas drain), no shut off, crankcase full, cylinder full. Touchy part was pulling the plug and hitting the starter to empty the cumbustion chamber. I made sure the plug was well shielded and not grounded. Installed a shut-off after the clean-up. Just have to remember to shut it off when finished using.
Harry K
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<<The usual fix is a carburetor kit which includes a new needle valve. If the seat is worn a carburetor replacement may be needed.>> If you take notice, the carb manafold runs downward to the intake valve. If they had reversed the exhaust/intake ports the fuel overflow would not be as serious a problem. Maybe a little different problem but wouldn't contaminate the oil. The float needle valve seat is simply a rubber O-ring type of thing. Very replaceable. I put a shut off valve on the fuel line as a quick fix rather than removing the carb. Then I reasoned a blast of air into the fuel line would plow the bugger out of there. I removed the float bowl, float and needle valve. Then I put a clean white rag below the carb and let blast. Sure enough, heard a pop and there it was in the rag. The replacement rubber seat for my engine had a right and wrong side for installation. It is a PIA getting the new one fully seated.
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