53 Cub fuel issue

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patdaddy
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Tractors Owned: 1953 Cub, 1954 Super C, 1947 John Deere A, John Deere 301A

53 Cub fuel issue

Postby patdaddy » Sun Jul 19, 2020 4:37 pm

Howdy. I’m having an issue with my Cub. It’s almost
like the fuel system is too airtight. I can turn the fuel on at the sediment bowl, and it won’t even fill up and flow out the line. If i disconnect the line, it’ll fill up and pour out. Put the line back on and it quits flowing. I have one of those new free tall fuel caps, could it not be venting? I have an about 2” piece of hard line at the bowl, then rubber line to a fuel filter, then rubber line to the shut off, then rubber line to a 2” piece of hard line at the carb. Any ideas? Thanks

k hutchins
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Re: 53 Cub fuel issue

Postby k hutchins » Sun Jul 19, 2020 6:40 pm

A couple things come to mind.
1 is your filter oriented correctly for flow? I've installed them backward myself before by accident.
2 what is your float setting? I just had an issue where when the carb was assembled the float was hitting the bottom of the bowl, then pushing up enough to close the needle.

Pull the plug on the bottom of the carb to make sure you have good fuel flow.
Why is there never enough time to do the job right, but always enough time to do it over. :?:

Eugene
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Re: 53 Cub fuel issue

Postby Eugene » Sun Jul 19, 2020 6:53 pm

And you need a gravity flow fuel filter, not a fuel filter for a car or tractor with a fuel pump.
I have an excuse. CRS.

patdaddy
Posts: 4
Joined: Sun Jul 19, 2020 4:28 pm
Zip Code: 97048
Tractors Owned: 1953 Cub, 1954 Super C, 1947 John Deere A, John Deere 301A

Re: 53 Cub fuel issue

Postby patdaddy » Sun Jul 19, 2020 8:17 pm

Thanks for those suggestions. The problem is, the fuel doesnt even want to get to the filter. It doesnt want to leave the sediment bowl. No line connected, fuel flows fine. Line connected, fuel doesnt want want to flow. Like its airtight, not venting. Its the wierdest thing.

Eugene
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Re: 53 Cub fuel issue

Postby Eugene » Sun Jul 19, 2020 8:19 pm

Replace the fuel line.
I have an excuse. CRS.

k hutchins
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Posts: 630
Joined: Tue Mar 27, 2012 5:48 pm
Zip Code: 48843
Tractors Owned: 1948 Farmall Cub
193 plow
1948 snow/grading blade
Woods 59 C3
Cub 144 cultivator
Cub 22 mower
Cub 172 one row planter
Original manuals for all the above
Circle of Safety: Y

Re: 53 Cub fuel issue

Postby k hutchins » Sun Jul 19, 2020 8:36 pm

Check your float. If the needle valve is closed it can't flow if there's no where for it to go.
Why is there never enough time to do the job right, but always enough time to do it over. :?:

Bob McCarty
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Re: 53 Cub fuel issue

Postby Bob McCarty » Sun Jul 19, 2020 9:16 pm

If the rubber line has been on a while, ethanol in the gas may have caused the ID to decrease with the deterioration it can cause.
"We don't need to think more,
we need to think differently."
-Albert Einstein

patdaddy
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Joined: Sun Jul 19, 2020 4:28 pm
Zip Code: 97048
Tractors Owned: 1953 Cub, 1954 Super C, 1947 John Deere A, John Deere 301A

Re: 53 Cub fuel issue

Postby patdaddy » Sun Jul 19, 2020 9:49 pm

I actually use ethanol free gas, so i dont believe thats the issue. I think i may replace the sediment bowl assembly and line with a new hard line.

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Barnyard
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Re: 53 Cub fuel issue

Postby Barnyard » Sun Jul 19, 2020 9:53 pm

You have a vapor lock. Unscrew the sediment bowl to let some air in. You should see some fuel movement.
There are two ways to get enough Cubs. One is to continue to accumulate more and more. The other is to desire less.

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Don McCombs
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Re: 53 Cub fuel issue

Postby Don McCombs » Sun Jul 19, 2020 9:53 pm

Does the tractor start and run?
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Glen
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Re: 53 Cub fuel issue

Postby Glen » Sun Jul 19, 2020 9:57 pm

Hi,
Cubs originally came with a metal gas line, from the gas strainer to the carburetor.
It won't deteriorate like a rubber gas line could.

Below is a listing at TM Tractor for a new metal gas line.
This gas line is for Cubs with a vertical exhaust system.
The threads have to be good, and the original size, in your gas strainer, and carb, to use it.

http://www.tmtractor.com/new/fl/864fp.htm

There is supposed to be a screen above the gasket in the gas strainer. :)

patdaddy
Posts: 4
Joined: Sun Jul 19, 2020 4:28 pm
Zip Code: 97048
Tractors Owned: 1953 Cub, 1954 Super C, 1947 John Deere A, John Deere 301A

Re: 53 Cub fuel issue

Postby patdaddy » Sun Jul 19, 2020 10:09 pm

If i pull the bowl off, put it back on, but have the fuel line connected, the fuel wont even begin to enter the line. The bowl wont fill high enough to enter the line. If i remove the line, the bowl will fill and flow out the line hole. Put the line back on, no flow. It seems like attaching the line prevents any air from allowing fuel to move.

Eugene
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Re: 53 Cub fuel issue

Postby Eugene » Sun Jul 19, 2020 10:17 pm

Remove the fuel line at the carburetor. See if you have fuel flow.
I have an excuse. CRS.

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Re: 53 Cub fuel issue

Postby inairam » Mon Jul 20, 2020 6:27 am

I am not a fan of the inline fuel filter. The bowl nd the filter on the top of the bowl is all you need. Like Barnyard said you can vabor lock the bowl.
When you only have 9 horsepower you need to know the names of all of the ponies!

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Re: 53 Cub fuel issue

Postby tomstractor » Mon Jul 20, 2020 7:24 am

If you open the drain on the bottom of the carb you will see the bowl fill, the air is just locked in the bowl with no where to go. When the carb
needs fuel it lets the air out with the fuel and fills the bowl with fuel.


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