Posted by paulinkansas on February 15, 2011 at 14:26:01 from (68.103.65.16):
On an Allis Chalmers D17 with a Marvel Schebler carb. This problem was happening about a month ago. I replaced the fuel line and installed an inline filter, replaced the pontoon float in the carb, and replaced the viton float needle and seat. Started it up and it ran fine for the next few weeks (about 5 hours of tach time). Last week it got down to -20, I added 5 gallons of gas to the tank along with 2 ounces of HEET gas line antifreeze, and immediately operated it it for about 15 minutes. I ran fine. Whenever I get ready to turn off the tractor, I close the valve at the sediment bowl and let the tractor run for about 30 seconds, then turn off the ignition key.
Today was the first time I started it since adding the HEET. It ran fine for about 2 minutes, then it started to cough and smoke. I closed the valve at the sediment bowl and it ran fine again. I opened the valve and after a minute it started to cough and smoke.
Why would the tractors carb start overflowing with gas again? The only variable that has changed is that for the last few days it sat with some gas in the carb that contained HEET.
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