Help with a Cub! Fuel issues????

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72chevelle
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Re: Help with a Cub! Fuel issues????

Postby 72chevelle » Mon Mar 14, 2022 5:12 pm

Don McCombs wrote:
72chevelle wrote:The eyelet for the linkage is Straight up.

Please explain what you mean by this.



Well I can’t figure out how the heck to load up an image to share so I just shared it on my instagram. https://www.instagram.com/p/CbGbq6TuED5 ... _copy_link

Clemsonfor
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Re: Help with a Cub! Fuel issues????

Postby Clemsonfor » Mon Mar 14, 2022 5:25 pm

72chevelle wrote:
Don McCombs wrote:
72chevelle wrote:The eyelet for the linkage is Straight up.

Please explain what you mean by this.



Well I can’t figure out how the heck to load up an image to share so I just shared it on my instagram. https://www.instagram.com/p/CbGbq6TuED5 ... _copy_link

It's probably too big. You have to reduce pictures to late 90s era file size for a picture.

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Don McCombs
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Re: Help with a Cub! Fuel issues????

Postby Don McCombs » Mon Mar 14, 2022 6:09 pm

That photo answers my question. The choke linkage is installed correctly.
Don McCombs
MD, Deep Creek Lake

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72chevelle
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Re: Help with a Cub! Fuel issues????

Postby 72chevelle » Mon Mar 14, 2022 6:49 pm

Im starting to think the main jet still might be a little clogged. It makes sense the tractor should idle without any input from the governor. I can’t think of anything else.

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Dale Finch
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Re: Help with a Cub! Fuel issues????

Postby Dale Finch » Mon Mar 14, 2022 9:03 pm

Have you checked the carb to manifold gasket to make sure it is not interfering with the throttle butterfly. I believe that is a Zenith, and the ithas a larger diameter butterfly than the IH carb. Thus, if the gasket hole is too small, it will bind enough to cause problems. When you manually work the throttle, you might not notice the resistance.

Just a thought, as others have had problems in the past. Solution can be to enlarge the gasket hole or put on a 2nd gasket. Worth a look...

Hang in there and good luck!
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indy61
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Re: Help with a Cub! Fuel issues????

Postby indy61 » Tue Mar 15, 2022 11:33 am

Is it possible your fuel line is collapsing?
Have you tried removing fuel line from carb and blowing all the way into fuel tank?
Have you tried it with a different or no fuel filter?

Untitled.jpg

indy61
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Re: Help with a Cub! Fuel issues????

Postby indy61 » Tue Mar 15, 2022 12:49 pm

Also check your fleabay carb to make sure this port is drilled.

https://www.farmallcub.com/phpBB2/viewt ... 0&start=42

carb.jpg

tldec50
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Re: Help with a Cub! Fuel issues????

Postby tldec50 » Tue Mar 15, 2022 12:56 pm

I think you may be sucking air around the carb gasket or exhaust/intake gaskets.I find my leaks with brake clean spraying the gaskets while it is running on full or half choke.Too lean of mixture will cause the problem and running on full or half choke is shutting off part of the air and creating close to right mixture to run.If you do not find any leaks your carb is the problem.Keep us posted.

72chevelle
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Re: Help with a Cub! Fuel issues????

Postby 72chevelle » Tue Mar 15, 2022 7:16 pm

tldec50 wrote:I think you may be sucking air around the carb gasket or exhaust/intake gaskets.I find my leaks with brake clean spraying the gaskets while it is running on full or half choke.Too lean of mixture will cause the problem and running on full or half choke is shutting off part of the air and creating close to right mixture to run.If you do not find any leaks your carb is the problem.Keep us posted.

I actually tried that. I have carb cleaner and I’ve sprayed it all around the intake manifold gasket and carb to manifold gasket. It never idols up. I even replaced the intake manifold gasket to make sure.

tldec50
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Re: Help with a Cub! Fuel issues????

Postby tldec50 » Tue Mar 15, 2022 8:49 pm

72chevelle wrote:
Don McCombs wrote:
72chevelle wrote:The eyelet for the linkage is Straight up.

Please explain what you mean by this.



Well I can’t figure out how the heck to load up an image to share so I just shared it on my instagram. https://www.instagram.com/p/CbGbq6TuED5 ... _copy_link

the plug on the end of the throttle shaft in photo does not look like it is seated correctly,and case appears to be cracked.that is another source for an
air leak,To me the fitment of the carb to manifold appears to suspect,just my thoughts.

72chevelle
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Re: Help with a Cub! Fuel issues????

Postby 72chevelle » Wed Mar 16, 2022 10:20 am

indy61 wrote:Also check your fleabay carb to make sure this port is drilled.

https://www.farmallcub.com/phpBB2/viewt ... 0&start=42

carb.jpg


100% this right here just moved me forward! I went in and my carb was not drilled. I drilled it out with an 1/8" bit ad boom it runs! however the cheap carb is dumping gas all over my floor.

Ne problem... My cheap ebay carb is not stopping gas flow with the needle and seat. When i had the carb apart I went ahead and checked the float level and set it at 1.4" from the bottom of the mating surface to the bottom of the float with the float closed. The needle is moving freely in the seat and doesnt seem to have any burls or anything on it. So now What should I do, I have a carb rebuild kit coming for the zenith or should I try nad get a new needle and seat for the ebay carb?

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Re: Help with a Cub! Fuel issues????

Postby Bob McCarty » Wed Mar 16, 2022 4:26 pm

IMO the viton needles only work 1/3 of the time. The other 2/3rds they either stick shut or don't close and leak. McDonald Carb sells a newly designed version that seems to work well. The OEM steel needle is the best, but expensive. I haven't checked to see if the ebay carb cages are the same threading.
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72chevelle
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Re: Help with a Cub! Fuel issues????

Postby 72chevelle » Wed Mar 16, 2022 4:37 pm

Bob McCarty wrote:IMO the viton needles only work 1/3 of the time. The other 2/3rds they either stick shut or don't close and leak. McDonald Carb sells a newly designed version that seems to work well. The OEM steel needle is the best, but expensive. I haven't checked to see if the ebay carb cages are the same threading.



The hex on it is a 10 mm so I’m not sure if the threads are metric or not. I saw a guy on YouTube that took buffing compound and polished the seat to get a better finish on it. I even went as far as to bend the Float way up so it should’ve been cutting off really early and it was just flowing right past it

72chevelle
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Re: Help with a Cub! Fuel issues????

Postby 72chevelle » Wed Mar 16, 2022 8:10 pm

Success finally. https://youtube.com/shorts/neMCpHhIRPc?feature=share I still need to adjust the carb and everything. Turns out the tang on the float was sticking out too much and was hitting the side of the bowl and not letting it close. There should be a sticky that says “ you bought a cheap eBay carb and it won’t work” try these things first :lol: :lol:

Clemsonfor
501 Club
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Posts: 1118
Joined: Sun Nov 10, 2019 5:14 pm
Zip Code: 29848
Tractors Owned: Yanmar YM2000
Yanmar YM186 (non running)
1952 Farmall Cub
Circle of Safety: Y
Location: Greenwood County SC

Re: Help with a Cub! Fuel issues????

Postby Clemsonfor » Wed Mar 16, 2022 8:20 pm

72chevelle wrote:Success finally. https://youtube.com/shorts/neMCpHhIRPc?feature=share I still need to adjust the carb and everything. Turns out the tang on the float was sticking out too much and was hitting the side of the bowl and not letting it close. There should be a sticky that says “ you bought a cheap eBay carb and it won’t work” try these things first :lol: :lol:

We need to flag this post with that one your talking about needs to be made. :lol:


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