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Carb is overflowing with gas

P

Paulinkansas

Member
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.
 
Problem is in the needle and seat. Ice maybe bent the float assembly or you have ice under the needle and or dirt under the needle .not allowing it to close off when carb is at the correct level for running. Hope this helps. Regards LOU.
 
The gas we get now has 10% alcohol so you dont have to add HEET.Check the content of HEET if it says methanol dont use it.Menthanol will attack all zinc based castings.Viton tips stick shut often.
 
I wonder if it is also possible that you have a pinhole in the float and it is taking on gas and not floating. That happened to me with my Allis C once.
Zach
 
Could be one of many problems. Sticking float, needle not seating as it should, dirt or rust in the needle seat or a hole in the float. Any one of those would cause the problem and if you try choking it when running that might be enough to pull the drit/rust out and run fine or you may have to open up the carb to fix. You could try turning the gas off and drain the carb and see if that helps or open the drain with the gas on and catch the gas to see if it has some junk in it
 
I had a similar situation with a tractor that was left with fuel in the bowl. Water had collected in the bowl, then froze and popped the float. The problem showed itself when the float was removed and was full of gas. Luckily Tractor Supply carried the float for the MF50.

Aaron
 
If you type "heet additive" in your search engine it says that heet [additives and methanol]immediately sinks to the bottom of tank because it and water are heavier than petrol, have a read.
 
Is it really worth trying to solve the mystery of WHY, rather than just fixing it and getting on with life?

Heck, we had the needle stick open on the W400 a couple of years ago. Totally flooded the engine, gas running all over the ground. We dragged it home, figuring on tearing down the carburetor. On a whim, we opened the fuel valve and it wasn't leaking anymore. So we dragged it around the yard until it started. Never touched the carburetor, and it hasn't been a problem since.

Don't worry about it. Just fix it.
 
Not all gasoline has Ethanol , there is a corridor from ND to texas, right down the center of the country where Ethanol is not manditory and all mixtures are sold.
The 87 octane stuff is ethanol free with E10, E30 and E85 all avalible from the same pump.

If your interested in knowing if and how much alcohol is in your local gasoline, Your Briggs & Stratton dealer sells a little kit that will tell you if and what % alcohol is in your fuel.
Cost right at $7 and will last forever.
Ethanol test kit.
 
(quoted from post at 13:38:45 02/16/11) Not all gasoline has Ethanol , there is a corridor from ND to texas, right down the center of the country where Ethanol is not manditory and all mixtures are sold.
The 87 octane stuff is ethanol free with E10, E30 and E85 all avalible from the same pump.

If your interested in knowing if and how much alcohol is in your local gasoline, Your Briggs & Stratton dealer sells a little kit that will tell you if and what % alcohol is in your fuel.
Cost right at $7 and will last forever.
Ethanol test kit.
Click to expand...

Kinda looks like Briggs and Stratton would just admit that Ethanol is here to stay and build the fuel systems to be compatible. Guess I won't be buying any more Briggs powered equipment.
 
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