Posted: 6/2/2014 7:39:58 PM EDT
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I picked up a project mower last week, its a 4-5 year old MTD/Murray 38" cut riding mower with a Briggs & Stratton PowerBuilt 344cc 13.5HP motor. The previous owner stated the mower would only run for a short period of time, lose power, and produce a lot of smoke. When I picked ut up, it wouldn't even turn over...all it would do was "click" when you turned the key. Assuming the battery was dead, I loaded it on the trailer and brought it home.
I charged the battery once it was home, and still got the "click" when you hit the key. I figured the cylinder was probably full of oil, so I pulled the plug. Plug looked OK, so I turned it over a few times to see if the piston pushed anything out. Cylinder was empty, but the oil was a little low on the stick. I added oil, and the mower cranked right up. Actually ran great, with no smoking. I ran it for about ten minutes, and was able to cut a little grass. Next day, I went out to check it. Again, I got the "click" when I turned the key. Pulled the plug again, this time gas poured out...cylinder was completely full. Turned it over a couple times too eject the gas out of the cylinder, then let it set again over night. Did the same thing yesterday, cylinder again filled with gas overnight. Went ahead and installled an inline cut-off valve on the fuel line, and pulled the carb. I figured the seat for the float was leaking, which would explain the gas pouring in through the intake. This mower is simply a gravity drain to the carb for fuel, with no type of fuel pump. It does have some sort of 12v activated magnetic switch at the bottom of the carb bowl, which was actuating correctly when the key was switched "ON". It apparently moves the float assembly inside the bowl, but I am not sure what the purpose is. Anyway, the float needle was correctly sealing off once I pulled it, so I am not sure why the gas would be pouring through. Maybe I shook something loose, I am not sure, but the entire crank case was full of gas. I changed the oil, and pretty much nothing but gas poured out when I pulled the drain plug. Any other reason to explain the gas foverflowing into the crank case and cylinder? I have a feeling that the inline cut-off will solve my issues, but it seems as though the float needle-valve was functioning correctly once I pulled it. Any suggestions? |
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The carb could have some debris lodged under the needle / seat keeping it from stopping the flow of the fuel
That engine has a carb with a bowl on the bottom , gas flows into bowl and raises float when it's full ( needle connected to float ) should stop flow of fuel when bowl is full . Yours is not Buy a needle and seat kit |