Fuel Line Fitting

Give the prize to hayhauler on the correct answer. The fuel line fitting that threads into the sediment bowl and carburetor is 7/16- 24 thread. The fuel line is 1/4" outside dia. Just returned from a Tool Supply Co, and they have those thread gages that on can use to determine the thread type and size. I must get me one of those... $40.00 he wants.

FD611V said:

Give the prize to hayhauler on the correct answer. The fuel line fitting that threads into the sediment bowl and carburetor is 7/16- 24 thread. The fuel line is 1/4" outside dia. Just returned from a Tool Supply Co, and they have those thread gages that on can use to determine the thread type and size. I must get me one of those... $40.00 he wants.

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Steiner Tractor (Site Advertiser) has the complete fuel line assembly for $14.95..:fing32:

Ken N Tx said:

Steiner Tractor has the complete fuel line assembly for $14.95..:fing32:

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Ken, I don't need the fuel line. My reason to know the thread size and type as I'm installing a 12 volt Automatic Fuel Filter and Shut off value where the old sediment bowl was. In doing this, it gives me piece of mind that the gas flow to the carburetor is shut off when I turn the ignition switch off. When I get installed I will post how it's done and the picture of the filter and value.

FD611V said:

Ken, I don't need the fuel line. My reason to know the thread size and type as I'm installing a 12 volt Automatic Fuel Filter and Shut off value where the old sediment bowl was. In doing this, it gives me piece of mind that the gas flow to the carburetor is shut off when I turn the ignition switch off. When I get installed I will post how it's done and the picture of the filter and value.

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Maybe I am just too simple, but turning the sediment bowl valve closed does the same thing. Since i do not use my tractor for much except for moving snow, I always shut the sediment bowl and let it run out of fuel before shutting it off. Turn it back on and always fresh fuel ready to fire up.

If that is what he wants then he should by all means do it. Me I just have conditioned (Pavlov trained) myself to turn the valve on before I put the key in then refill the tank and turn it off before I take the key out. Topping off the tank at the end of each use is my trigger to turn the valve off.

To those who might have some interest in adding a 12 volt Automatic Fuel shut off value, I'm about ready to start the project. I have shut off value as pictured here and the brass fittings should arrive on Friday to connect it all.
I certainly had a hard time finding the correct "fittings to make the right connections. The brass "nipple" from the sediment bowl housing is a 7/16"-24. It connects to a straight 7/16"-24 female that has a 1/8"-18 male thread adapter. This adapter connects to the fuel shut off value that has 1/8"-18 NPT threads on both female sides. On the carburetor side of the shut off value I connect another 1/8"-18 male adapter that has a 7/16"-24 female. I'm going to use the 8N standard 1/4" dia steel fuel line, and it will connect to the 7/16"-24 female adapter. From there I wire one wire to a ground fuse panel and the other (hot) wire to the fuse panel that has the hot side of the ignition switch wired. Wen all is done, I turn the ignition switch on and the fuel shut off value opens allowing fuel to flow to the carburetor, and when the ignition switch if off the fuel flow is closed to the carburetor.










If anyone is interested in buying some 7/16"-24 fuel fittings and other rare old brass fittings. I have found a source....www.speedwaymotors.com in Lincoln, Ne.

The only possible trouble I see is having the ignition on for awhile till the float bowl fills with gas.

I am religious about my fuel shut-off and do as other shave suggested making sure it is part of my routine to turn it off manually. In getting ready to start the tractor, I turn the valve on for maybe 1 minute to let the fuel flow to the bowl, making sure not to have it on too long. Then I "try" to start it.

With your setup you would have to leave the switch on for that minute or so without the tractor running. I as at least a few others have experienced have had points burn out which is not fun. Especially if you (I do) have a FEL.

If your tractor starts easier than mine all is good though.

Speedy, You don't have to turn on the gas value on the sediment bowl to start and run the tractor. If your carburetor is in perfect running condition and will hold gas in the carburetor fuel bowl, the engine will start and run till it empties the carburetor. When I turn on the ignition switch the fuel shut off value will allow gas to flow to the carburetor I don't need to wait till the gas fills the carburetor bowl, as there's enough gas there to start the tractor.
Leaving the ignition on after the engine is shut down will not cause the carburetor to flood. That will only happen if the carburetor isn't in great condition.


Like GB in MN said, he doesn't have to worry about shutting off the sediment bowl value, as his carburetor in in a great condition. I have left my sediment bowl value open many times, but no gas flow/leaks from the carburetor. The carburetor on my '59 8N is a Zennith model and I'm very happy with it over the old original TSX33 carb that came with the tractor.

Ken, I appreciate you being thoughtful here and advising all the better things and ideas on old N tractors. I've converse with Phil Smith at Red Rock Mfg. on their automatic fuel shut off value and come to the fact he has too many fittings to make their setup. I only have three brass fittings to contend with...meaning less chances for leaks. Also the fact my automatic shut off value has a price tag of $26.30, plus $6.00 shippings. The brass fittings are $2.99 ea. with a total of $38.25.

Anyway, thanks for the link.