Ford 9n 1939

toj01 · Dec 4, 2018

My wife call's her Bertha. I rebuilt her a couple of years back. Hard to believe a tractor from 1939 still works has hard as she does. Well last month because I did not address a stuck float my wife over opened the shut off to the tank shut off and out it came. Gas every where. I could never get it to reseat so I ordered a new assembly. I installed it and filled the tank. Opened the assembly, bowel fills, and tractor starts. Runs for about 30 seconds and fails. Bowel is full by view. If you wait for about a minute tractor restarts and runs for about 30 seconds and fails again. Like it is starving for fuel. So I am thinking am I missing the big picture. Am I getting duked by perhaps an electrical problem. Each time it's the same amount of time. Air lock? Any suggestions. It's winter and Bertha has work to do.

TJ

OregonAaron · Dec 4, 2018

If you want to verify that fuel it getting to the carb open the float bowl drain (1/8 NPT plug on bottom) and watch the flow out. If the stream is steady and doesn't stop, then you are getting fuel to the float bowl. If you do not see a steady flow, disconnect the fuel line and watch for a steady flow from it. This way to can isolate the problem to fuel supply or carb issues. Also, are you running an inline filter? If so, alot of folks have had issues from running one on a gravity fed system.

Ultradog MN · Dec 4, 2018

Welcome to Yesterdays Tractors TJ.
You will likely find guys here on Tractor
Talk board who know those Ns as well as any
man alive.
But you'll reach a whole lot of those type
fellows if you post this over on the N
Series forum.
nnalert the N board.

whereswaldo · Dec 4, 2018

How much time between filling the tank and opening the fuel valve? Could be when the tank ran dry, adding gas stirred up what normally sits on the bottom and has clogged the internal screen in the tank.

Den N Ms · Dec 4, 2018

toj01,A 30 second run points to a fuel issue.Remove the 1/8 plug on the bottom of the float bowl and check fuel flow through Bertha's carburetor.Catch the gas in a pint jar,with the fuel turned at the sediment bowl 2 turns it should fill a pint jar in about 2 minutes.If it won't check all 3 screens one at the carburetor inlet elbow.one at the sediment bowl top,and one at the top of the shut off valve inside the tank.

Bob · Dec 4, 2018

As the others say, check the screens and for fuel flow through the carb.

It's even possible that the float can't drop enough to allow adequate flow through the inlet valve needle and seat due to QC issues with the new carb. (Float bent and hitting float bowl, for example.)

A simple way to see what the fuel level is and to verify that it's dropping after startup, get a 1/8" MPT brass hose barb and some matching clear hose and install it in the place of the bowl drain plug or petcock.

Hose will fill to the level of the gas in the float bowl, giving an external visual indication of what's going on inside the float bowl.

<img src = "https://i.ytimg.com/vi/PjEBvZEgdMY/hqdefault.jpg">

NOT a very good photo, but it illustrates what I wrote about.

INCase · Dec 4, 2018

have to ask where you got the "new valve assembly"?

is it an foreign made aftermarket?

if so i would suspect it is faulty either in design or construction. maybe also check to make sure some pipe tape/dope if you used any isn't blocking the valve inlet or outlet.

if it ran good before, you gotta look at what has changed.
1, installation: you took the old valve off and put something else on
2, Part: new part might be bad or defective ect ect.

old · Dec 4, 2018

Do some pimple trouble shooting. Fire it up then
#1 check that you have a good blue/white spark that will jump a 1/4 inch gap the moment it dies.
#2 pull the carb drain plug and make sure you have a good steady flow of gas that will fill a pint jar in less then 3 minutes. YES catch the gas to make sure it does not have water/dirt etc. in it.
#3 when was the last time you serviced the air cleaner and dumped out the water and mud?? And fill it with fresh oil

Ford 9n 1939

toj01

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OregonAaron

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Ultradog MN

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whereswaldo

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Den N Ms

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Bob

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INCase

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old

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