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What to do with my Super C fuel system

J

JohnV2000

Member
My Farmall Super C will not run smooth unless I choke it about halfway.

Even at low idle, it does not run smooth unless choked halfway. When I quickly open the throttle as suggested by Steve at advance, the engine sputters without the choke, but with the choke, it runs fine.

When the engine is choked halfway, it runs perfectly as if nothing is wrong.

My question is, could this be an issue with the fuel line or should I take off the carburetor and do some maintenance?

If I remove the gas line from the carb and let it empty into a mason jar, how much gas should flow out in a minute? As suggested by someone here, I will try this tomorrow to see if it is blocked up.

If you have followed my previous questions, I thought I fixed the issue of the tractor stalling going up hills by removing some grit from the fuel inlet port into the sediment bowl. However, now the tractor will not run smooth without being choked.

John
 
On the bottom of the float bowl you should have a carb drain plug. Fuel should flow out of that drain fast enough to fill a pint jar in less then 3 minutes. But that said if you have a weak spark it too can cause the same problems so make sure you have a blue/white spark that jumps a 1/4 inch gap or more before doing the drain plug test
 
Pull the plug out of the carb bowl and make sure you have steady flow then the fuel line then tank. I suspect it's not getting flow or the carb needs cleaned. May have a filter on carb. I'm not familiar with yours.
 
Thank you for your help.

Tomorrow, I will test the gas flow at the fuel line and also at the carb drain plug.

If there is good flow in the fuel line, I will assume the issue is with the carburetor, in which case I will take it off my tractor and do some cleaning and possibly a rebuild.

If for some reason the issue is before the carburetor, I will try to isolate the problem and clean out the fuel lines.

Does my reasoning seem sound?


Thanks,

John
 
Cleaning the carb is routine maintenance on these old engines. It's something you'll need to do on a regular basis. Since you don't know when was the last time it was cleaned, I suggest you clean it real good, inside and out, and keep a record of the date you did it. Next time it needs cleaning you'll have a rough idea how often it needs to be done. For seldom used engines, you may find yourself taking it apart every couple years.
 
From former discussion you have the supply fixed. The fact that it runs OK with the choke out (and keeps running OK
means that the supply does keep up. The choke cannot pull extra fuel from the line, so the issue is inside the
carb. Watch some youtube one barrel carb cleaning, then do it. You might not even need a kit. Jim
A bunch of them
 
Remove gas line then removed 90 degree
elbow on carb. Some elbows have a
screen. Tha elbow on my gas tank was
choked up. Tractor was only 15 years old.
cvphoto25503.jpg

If you have just one fuel adjustment on
carb turning the jet clockwise will add
more gas to the mix.

Post pic of carb.
 
If the tractor runs fine with some choke I would start by looking for a vacuum leak. Maybe the carb or the manifold is loose or maybe a hole has developed on the intake side.
 
If I remove the gas line from the carb and let it empty into a mason jar, how much gas should flow out in a minute?

John
Click to expand...

Per "Nebraska Test #458" your tractor will burn 2.3 gallons of gasoline in an HOUR at full load and less than a gallon an hour at very light load.

So a flow of 5 fluid ounces a minute will sustain the needs of the engine at "full load".

There's 8 fluid ounces in a cup, so, while normally one would expect MORE than that to flow from the tank, through the carb, and out the drain plug for testing, a little more than a half-cup a minute is all the engine will ever be able to use/need.

HTH!


https://digitalcommons.unl.edu/cgi/...amp;article=3302&context=tractormuseumlit
 
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