Ford 8n Carburetor Issues

getback63 · Oct 14, 2019

Hi all,,I bought this tractor last summer and never had a issue with it.But thats all changed.
Now when ever i start it i have to chock it?
If and when i get it started i'll try and drive it around then she shuts down,,acts like it's starving for fuel.
Is there anyway a guy can test a Carb to see if that's the problem?
It does have a inline filter,I checked the gas flow and it seems to be normal.
Any ideas would sure be appreciated ,,

Bruce (VA) · Oct 14, 2019

" It does have a inline filter,I checked the gas flow and it seems to be normal."

Remove the bolt in the bottom of the carb bowl. Turn the gas on. Will the gas fill a pint jar in under 2 minutes?

Is your carb an OEM Marvel, or an after market clone? If you don't know, post a pic.
75 Tips

getback63 · Oct 14, 2019

(quoted from post at 13:17:31 10/14/19) " It does have a inline filter,I checked the gas flow and it seems to be normal."

Remove the bolt in the bottom of the carb bowl. Turn the gas on. Will the gas fill a pint jar in under 2 minutes?

Is your carb an OEM Marvel, or an after market clone? If you don't know, post a pic.
75 Tips

Ok, I will try the jar test. But should I test it before the filter or after the filter? Or maybe take the filter off then test it. If it doesn't fill the jar does that mean the carb is plugged up?
Thanks much for the reply

JMOR · Oct 14, 2019

(quoted from post at 17:05:10 10/14/19)

(quoted from post at 13:17:31 10/14/19) " It does have a inline filter,I checked the gas flow and it seems to be normal."

Remove the bolt in the bottom of the carb bowl. Turn the gas on. Will the gas fill a pint jar in under 2 minutes?

Is your carb an OEM Marvel, or an after market clone? If you don't know, post a pic.
75 Tips

Ok, I will try the jar test. But should I test it before the filter or after the filter? Or maybe take the filter off then test it. If it doesn't fill the jar does that mean the carb is plugged up?
Thanks much for the reply

Click to expand...

"But should I test it before the filter or after the filter? "

Click to expand...

Well, let me ask you this.....is the filter ahead of the carb bowl drain?????? Sheesh! What is the answer in minutes? and we go from there.

Bruce (VA) · Oct 14, 2019

Turn the gas on 2 turns exactly. Remove the bolt in the bottom of the carb. Does the flow fill the pint jar in under 2 minutes? If not, remove the brass elbow. Test the flow there. If it fails the test, then remove the line before the filter. And check out tip # 15; time to re-think that in-line filter even if it does work.
75 Tips

getback63 · Oct 14, 2019

Hi Bruce
I removed the bolt and gas did come out,,after about 35 seconds the gas stopped coming out.I got maybe 1 to 2 inches in the jar.I'll make it 1 and a half inches in the jar.I believe that amount was in the bowl of the Carburetor. So maybe plugged somewhere?

Thanks much for your reply..

getback63 · Oct 14, 2019

(quoted from post at 14:29:00 10/14/19)

(quoted from post at 17:05:10 10/14/19)

(quoted from post at 13:17:31 10/14/19) " It does have a inline filter,I checked the gas flow and it seems to be normal."

Remove the bolt in the bottom of the carb bowl. Turn the gas on. Will the gas fill a pint jar in under 2 minutes?

Is your carb an OEM Marvel, or an after market clone? If you don't know, post a pic.
75 Tips

Ok, I will try the jar test. But should I test it before the filter or after the filter? Or maybe take the filter off then test it. If it doesn't fill the jar does that mean the carb is plugged up?
Thanks much for the reply

Click to expand...

"But should I test it before the filter or after the filter? "

Click to expand...

Well, let me ask you this.....is the filter ahead of the carb bowl drain?????? Sheesh! What is the answer in minutes? and we go from there.

Click to expand...

/quote]
Yes the filter is before the carb. But,,the filter is located on the other side of the engine. The pipe from the gas tank is on the opposite side and that's where the filter is located. The fuel line runs over the top of the engine. Maybe I'm wrong but I have a feeling that the filter is the problem, what do you think?

HCooke · Oct 14, 2019

Remove the brass elbow on the carb that the gas line attaches to. There is a filter there. It may be clogged.

Bruce (VA) · Oct 14, 2019

Rather than guess, we suggested you test the flow starting at the carb.

I guess at Lottery numbers, not tractor problems!

See tip # 56 before you remove that carb elbow.
75 Tips

Bruce (VA) · Oct 14, 2019

Yep.

As Harold said, remove the elbow. If no good flow there, then remove the inline filter and test the flow there.
75 Tips

R Geiger · Oct 14, 2019

(quoted from post at 16:15:23 10/14/19) Yep.

As Harold said, remove the elbow. If no good flow there, then remove the inline filter and test the flow there.
75 Tips

I would check flow after the inline filter before I took the elbow filter off.

getback63 · Oct 14, 2019

Ok Bruce,, I can see i made some goofy replies,,I'm running out of time here so if i don't post i will tomorrow,, And i will be very careful with the elbow..
Thanks again for the help..

getback63 · Oct 14, 2019

Thanks Hcooke I will do what you suggested..

Eman85 · Oct 14, 2019

(quoted from post at 15:29:06 10/14/19) Thanks Hcooke I will do what you suggested..

Quick check is when checking flow at bottom of carb is to remove gas cap. No air in no gas comes out.

Tim PloughNman Daley RIP · Oct 15, 2019

What Bruce sez. First of all, you do not need an external in-line fuel filter, but it's your tractor and your $$$ so do what the heck you want, but you asked. Do you also have a plastic, rubber, or copper fuel line? If so, get rid of them. There are THREE (3) filters in the fuel system as standard OEM parts. Perform the fuel flow test. Fail? I suggest to yank the inline gizmo off first. Filters plugged, vent hole plugged, dirty carb - all possible causes. When was last time you serviced your carb? OEM FORD parts are designed to be rebuilt over and over. No need to buy something new made by the ChiComs. Need help? I will service your OEM Marvel-Schebler carb -just ask -email is open.

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getback63 · Oct 15, 2019

Thanks Eman85,, Never thought of removing gas cap..But only makes sense.
I will post my results,,
I did the jar test and it ran maybe 30 seconds then no more fuel came out.
I would guess that all the fuel came from the bowl of the Carb,,
The drain pipe drops maybe 2" then the fuel line goes to a inline filter,
Then the hose goes up and over the engine down to the Carb..
This filter is one of those metal non see through type filters. I will replace it.I wonder?
should i go with a glass filter or just a see through filter.Or does it matter?
Thanks again for your reply..

Tim PloughNman Daley RIP · Oct 16, 2019

Probable NO-GO fuel issue causes are: plugged vent, plugged screens, plugged sediment bulb, dirty gas tank, dirty carb, and more. There are three OEM screens in the fuel system. Two are on the Sediment Bulb Assembly; the 3rd is on the brass elbow inside the carb where the fuel line connects to. SEE PICTURES. I wouldn?t be shoving anything, wires especially, up into the sediment bulb assembly. You have a vertical fine mesh screen on the inlet port inside the tank that you can damage. Best solution is to remove the tank and thoroughly clean.
FORD N-SERIES TRACTOR FUEL SYSTEM & POSSIBLE CAUSES OF NO FUEL:

The ESSENTIAL MANUALS are your friend. PM is so important to maintain any piece of machinery.

Tim *PloughNman* Daley(MI)

getback63 · Oct 16, 2019

Hi Tim,,Thanks for this information..I saved it to my PC,, Wish I would have thought that there was a screen in the tank..I used wire to unplug the valve. This tractor doesn't have that Bowl under the tank,Just a inline valve to shut it off or turn it on.Most likely removed by someone.I think I will put in a see thru filter to keep track of the debris coming from the tank.It could snow any day now and I don't want to get caught in it.Don't have a shop to work in.So if i can get thru the winter then I will tackle it in the spring.

R Geiger · Oct 16, 2019

The screen in the tank is part of the OEM sediment bowl, so if you just have a shut off valve, you have no screen in tank. the screen in the tank also really only filters the fuel for the aux position of the shutoff valve. The screen is open ended and the main fuel tube pulls fuel from at about the top of the screen.

getback63 · Oct 16, 2019

Thanks R Geiger,, I didn't know this.So i wonder,,I'm thinking about installing a see thru filter,,Is that a good idea?

R Geiger · Oct 16, 2019

If it were mine I would install an original style sediment bowl and do away with a inline filter. And make sure the tank is fairly rust free. I put a liner in one tank and after all was said and done, I wished I had just replaced the tank with anew one. That said , it has been working for about 7 years with no problems.

getback63 · Oct 18, 2019

(reply to post at 14:35:53 10/16/19)

I think your right about adding the glass bowl,,Got to find one first.If and when i get one I will install on the spot.
I really appreciate your help.
Thanks so much.

Ford 8n Carburetor Issues

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