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Hi Wayne, first, does your tractor have the automatic safety fuel shut off feature on the glass sediment bowl which cuts the gas off when theres low or no oil pressure or the tractor is shut off etc. ????? ? They are the ones with the diaphragm and oil lines running to it and the oil pressure gauge. If so, sometimes their rubber diaphragms leak allowing gas to enter the oil via the lines. If after you change oil you by pass or reroute the lines so no oil goes there and the problem stops, that was maybe the source. The line is out of the tractor, to a T at the sediment bowl, then to the oil pressure gauge, and it wotn harm anythign if its not used, just maybe the gauge dotn work dependign upon how you plumb it. However, the lil top nut has to be loosened and that bolt pushed down to allow gas to enter and fill the sediment bowl and it has to stay or be kept down. NEXT, if thats not the problem, it could be the carbs needle valve and seat is bad and leaking or the float (may leak) or its level is out of adjustment, any of which can allow excess gas to get in with oil. However, if thats so and its a bad leak and it happens when running, it should start spitterign and sputterign and black smoking with gas runnign out the front of or near the carb. The auto shut off should turn off gas when its setting, but if its not and the needle and seat or float problem are only creatign a slow leak, gas could be gettign into the oil those sittign periods. Other causes of small amounts of gas to get in the oil are running the carb way too rich (does she black smoke out teh stack much????? ? or the choke butterfly plates arent tight on their shaft or the choke and spring/ rod assembly isnt workign right and the choke is remainign partly closed wehn it should be open, but that should cause a lot of black stack smoke. Otehr causes of smaller amounts could be an air restriction in the intake pipe or air cleaner. Have you servuiced it and the bowl lately??? If the needle and seat are working okay, and she never black smokes, and always runs well, and it has the auto shut off on the sediment bowl, and takes on a lot of gas in a short period, I suspect a leaky diaphragm as above. they can be rebuilt fairly easy. John T Nordhoff in Indiana
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