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Ford Tractors Discussion Forum
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Carburater

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10tofour

08-23-2006 20:14:48




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I'm having trouble with my Ford 800. I put gas in the gas tank and it runs right out through the choke valve on the carb. This tractor has not been run for over a year because of some other problems. I don't know much about carbs but am thinking it may be the float. Any advice will be appreciated. Thanks.




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BruceR TN

08-24-2006 18:02:11




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 Re: Carburater in reply to 10tofour, 08-23-2006 20:14:48  
Ditto on the Stabil (or other reputable fuel stabilizer). I use this in all my seasonal equipment (i.e. lawnmowers, weedeaters, chainsaws, tractor, etc.). It's relatively cheap, and in addition to stabilizing the gas and preventing varnish, it helps condition rubber parts like seals and diaphrams. Doesn't hurt a thing to use it in your gas all the time. I have an "el-cheapo" weedeater that is now 13 years old and I haven't even changed the plug. Starts in about 3 or 4 pulls every time. FWIW.

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MarkB_MI

08-24-2006 03:54:05




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 Re: Carburater in reply to 10tofour, 08-23-2006 20:14:48  
Given that the tractor has been sitting, you probably have bad float needle and seat. You can buy this part from New Holland for a reasonable price.

Another source of trouble can be a bad float. When you disassemble your carb, shake the float and listen for gas inside.

If you left the fuel turned on while the tractor was idle, then the carb is probably full of "varnish" and will need to be thoroughly cleaned out with carb cleaner or lacquer thinner. Clean out all passages with a thin wire.

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old

08-23-2006 21:14:52




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 Re: Carburater in reply to 10tofour, 08-23-2006 20:14:48  
4 years and not run well then you need to rebuild the carb. The carbs are simple and if you buy a good kit it will have an instruction kit in it that a 5 year old could figure out. Floats probably stuck and or the carb is full of rust etc.



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slip

08-23-2006 20:44:00




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 Re: Carburater in reply to 10tofour, 08-23-2006 20:14:48  
I have the same problem with my John Deere MT. After rebuilding the carb, the inlet needle occasionaly sticks and the gas runs out because the float isn"t pushing the needle into the seat enough. My fix? A tap on the bowl will shake the needle free. I put a shut off valve inline with the carb and always shut off the gas when I am not using the tractor. I am thinking on doing the same thing with my new Ford 861. The shut off valve is cheaper than the gas that leaks out. I have read that the stock shut off valve is expensive and easily broken, hence a third party lawn mower shut off valve.

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Dean

08-24-2006 05:08:41




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 Re: Carburater in reply to slip, 08-23-2006 20:44:00  
Slip:

The symptom that you describe with your MT is a rather common one on old farm tractors. It is usually caused by the float sticking.

The float assemblies in these old carburetors usually have two brass floats soldered to a steel bracket forming a Y-shaped assembly. Usually, the float bowl surrounds the venturi and the Y-shaped float fits into the bowl with one float on either side of the venturi.

If the float bracket is bent the float can bind against the inside or outside of the float bowl causing it to stick open when the tractor is not running. Usually, this does not happen with the tractor running because the vibration is enough to dislodge the float.

Another common cause of this is improper adjustment of the float drop setting. If the float is allowed to drop too far, it can wedge into the narrowing float bowl near the bottom if you run the tractor out of gas or intentionally turn the gas off and allow the engine to run the gas out of the carb. If it does, the next time you turn the gas on the float can stick causing the float bowl to overflow.

I suspect that you will find one of these problems when you take your carb apart.

Dean

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Brad_bb

08-24-2006 15:06:37




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 Re: Carburater in reply to Dean, 08-24-2006 05:08:41  
I"ve had this happen on classic cars, my 55 Ford tractor when I first got it, a gas powered leafblower and a couple other carb"d engines. I"ve never had a bad float, it"s always the needle sticking open or sticking closed. Open and the fuel keeps running like you describe. Closed and she doesn"t want to start. Invariably it"s usually caused by debris or varnish in the needle/seat area. Make sure to start using Stabil in your gas when you are going to store an engine without regular use for a period of time. This will prevent the formation of varnish and keep the fuel good for up to 2 years (sometimes longer).

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