Thank God for this forum

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Brodalick
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Thank God for this forum

Postby Brodalick » Fri Feb 16, 2018 3:24 pm

I got the front end fixed and my wiring issue corrected, thanks to this forum. Well with good news, bad news seems to always follow not far behind. My cub runs great from idle to full throttle. Here's the problem. Leave it idling for very long and the fuel filter goes dry and it shuts off. Have to choke it to get it cranked. Running wide open no issues. Does carb pull gas through a vacuum? I hate to go into the carb but if I must I will. Nothing seems stopped up and fuel tank is clean and gas lines flow freely.

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Re: Thank God for this forum

Postby ajhbike » Fri Feb 16, 2018 3:41 pm

It is gravity fed I believe....Is your gas cap vent working?

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tmays
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Re: Thank God for this forum

Postby tmays » Fri Feb 16, 2018 3:52 pm

Where is the filter? Is it a gravity feed filter?
Thomas

ajhbike
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54A Blade, 54-L Blade, C-22 Sickle
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Re: Thank God for this forum

Postby ajhbike » Fri Feb 16, 2018 4:29 pm

Try taking the filter off.

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John *.?-!.* cub owner
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Re: Thank God for this forum

Postby John *.?-!.* cub owner » Fri Feb 16, 2018 6:56 pm

Many filters are designed to work with a fuel pump, you need to use a small engine filter on a cub. The vibration from the engine running at full throttle may cause more fuel to flow, which would be the reason it does not starve out at full throttle, but does at idle.
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Mike in Louisiana
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Re: Thank God for this forum

Postby Mike in Louisiana » Fri Feb 16, 2018 7:08 pm

You are saying filter, not sediment bowl under gas tank right ???
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and a lot of that comes from bad judgment. Will Rogers

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Glen
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Re: Thank God for this forum

Postby Glen » Fri Feb 16, 2018 7:18 pm

Hi,
Below is a page from the 1949 Cub owner's manual showing the fuel strainer under the gas tank, that is the only gas filter that a Cub originally came with. They work good if the gas tank is fairly clean inside. They need cleaning when the manual says, and the screen might need replacing, they tear from age sometimes.
It might need a new bowl gasket, sometimes they don't seal again if you remove the bowl and try to reuse the old gasket.
TM Tractor has a new screen, and bowl gasket too.

http://farmallcub.com/rudi_cub/www.clea ... age-25.jpg

I have read on here that added on gas filters can cause flow problems.
The Cub originally had a steel gas line, from the gas strainer to the carburetor.

Below is a listing at TM Tractor, with pics. :)

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

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Re: Thank God for this forum

Postby Brodalick » Fri Feb 16, 2018 7:29 pm

My bowl is clean and good gasket. Rubber gas line from bowl to filter and rubber gas line to carb. Never knew about a gravity fed/ small engine filter. Thought they were all the same. Mine is a regular one from Auto Zone. Probably one for an auto. Gas cap vent is open because it spews gas all over the hood. Learn something new very day.

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Re: Thank God for this forum

Postby Glen » Fri Feb 16, 2018 8:05 pm

Hi,
If the gas cap leaks gas out on the hood, that is not really a safe way to use the Cub. The gas cap gasket can get hard and shrink from age, then they don't seal anymore.

TM Tractor has a new gasket, this is for the original type of gas cap, I think.

http://www.tmtractor.com/new/fl/785fp.htm

Case IH offers a free replacement gas cap too. You can read about it at TM Tractor. They look different than the original.

http://www.tmtractor.com/new/fl/fuelcap.htm

If the surface on the gas tank that the gas cap gasket seals on is rough, or bent, it can cause sealing problems too. Some of the guys on here have tools to straighten the gas tank surface where the gasket seals. :)

Brodalick
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Re: Thank God for this forum

Postby Brodalick » Fri Feb 16, 2018 8:13 pm

Already did form for replacement cap. Gasket is good on mine but leaks from the top vent hole.

Jim in SC
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Re: Thank God for this forum

Postby Jim in SC » Sat Feb 17, 2018 7:25 am

Brodalick wrote:My bowl is clean and good gasket. Rubber gas line from bowl to filter and rubber gas line to carb. Never knew about a gravity fed/ small engine filter. Thought they were all the same. Mine is a regular one from Auto Zone. Probably one for an auto. Gas cap vent is open because it spews gas all over the hood. Learn something new very day.


I see you have an aftermarket "rubber" fuel line. Lots of owners get tired of turning the gas on and off using the OE sediment filter and fuel line. I know I did. I retained the sediment bowl (with a new gasket and screen), but replaced the metal fuel line with the rubber type fuel line. I also installed a gravity type fuel filter and an on/off petcock between the sediment filter and the carb. This way the sediment bowl catches most of the trash that can clog the fuel line and the second filter gets the rest. The petcock just makes it way easier to turn the fuel on or off to the carb. I just leave the sediment bowl cut-off lever in the "on" position all time. I think there is even a guy on ebay that sells the whole set up. I just made mine. I know it's not "original," but it does work better.

I echo the comment that your fuel feed problem is probably in the inline fuel filter you have. Should go away if you get a "lawnmower" type of filter - very inexpensive. And try adding in that petcock too - you might be surprised how much easier it will be then!
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Brodalick
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Re: Thank God for this forum

Postby Brodalick » Sat Feb 17, 2018 4:01 pm

Is it necessary to turn fuel off when your ready to put tractor up for the day?

ajhbike
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Woods 59 CLF
54A Blade, 54-L Blade, C-22 Sickle
C-21-P Sickle Mower
72" Rear Blade, Carryalls, Pallet Forks, IH 263 2 Row Cultivator, 7' Rake, Brush Hog, Horn-Draulic FEL
Location: Branford, CT

Re: Thank God for this forum

Postby ajhbike » Sat Feb 17, 2018 5:34 pm

I too out the on off fuel valve on 2 of the 3 tractors that have flexible fuel lines and I always shut off the fuel and let the engine die. People here say that things get gunky if you don't and I follow their advice and haven't had a problem

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Re: Thank God for this forum

Postby staninlowerAL » Sat Feb 17, 2018 5:58 pm

ajhbike wrote:I too out the on off fuel valve on 2 of the 3 tractors that have flexible fuel lines and I always shut off the fuel and let the engine die. People here say that things get gunky if you don't and I follow their advice and haven't had a problem

And if the needle valve does not seal off for some reason you might empty the fuel tank on the ground overnight.

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Re: Thank God for this forum

Postby Brodalick » Sat Feb 17, 2018 6:06 pm

Oh yeah not a good morning when you open up the shop to the smell of gas and an empty tank.


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