Cub Cadet Carb Issues

1970-1655

Member
I have several Cub Cadets. Most run decent but one has carb problems. It is a 1200. I can run it all day or just a short time and it runs real good. If I shut it off and leave it over night, the tank is empty the next morning. Yesterday, I decided to fix it. I checked the carburetor completely and found nothing. Still has gas pouring out after about 2 or 3 minutes. I tried 4 known good carburetors and changed floats and needle/seat and it still does the same thing, gas running on the ground. All these carburetors are very clean inside and out. The floats are in good condition. I even tried lowering the float setting. The only difference I can see between this tractor and some of the others is it has a 3/8" fuel hose but the others have a smaller hose, maybe 5/16".

What am I missing?
 
Make sure the gas isn't leaking out somewhere else and running down the fuel line and dripping off the bottom of the carb
 
Just got in from playing with it more. With the air filter off, it is easy to see gas is coming out the throat of the carburetor. I pulled the carburetor off a running 1250 Cadet and put on it. This one has not been ran in about 2 weeks and the tank is full yet. It did the same thing.
 
Try bypassing fuel pump & running a temp hose to carb connected to line from tank,see if carb still leaks gas,if it does you probably have a bad diaphram/other problem in pump,normally pump will stop/restrict gas flow to carb when eng at rest,if diaphram in pump has a hole in it or some other internal leakage problem in pump body gas will gravity feed to carb thru pump,depending on amount of gas in tank/height of tank static pressure on gas in line may be higher than normal pump pressure pushing float needle open.
 
First, if your CC 1200 is like mine, it has no fuel pump, so the pump is not causing your problem.

I"m guessing you have replaced the float valve in these carburetors. The old steel needle and seat had to be about perfect to stop the fuel flow. There is also supposed to be a seal under the seat. If it is not there fuel can find its way past the seat threads.

If none of this helps and If it runs well in all other respects, Your best bet is to put a shutoff in the fuel line.
I have 3 of that series of Cub Cadet, 2 have a push-pull shutoff and one uses a quarter turn shutoff. None of them can be accessed without removing the left side panel.
 
Thanks to all the replies. I hope someone else can benefit from my find also.

I kept messing around in my left overs box and found a very weak spring. I got to looking in a Kohler parts book and it lists the spring for rough terrain or vibration applications so the float does not bounce too much. I put the spring in under the float and it works. Just to see how good, I put the spring in 3 other carbs and all did not leak any more.
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top