1953 NAA fuel problem

Anonymous-0 · Jun 29, 2012

I replaced the sediment bowl assembly and the fuel line from there to the carburetor on my Ford NAA Jubilee and that solved my fuel flow problem. However the compression joint at the sediment bowl assembly leaks. I put teflon tape on it but that didn't help. Decided to put tape AND plumbers dope on it (any comments on this? Can't see how I might use O rings???) I closed the fuel flow valve on the bowl assembly so I could disconnect the fuel line compression joint but it kept leaking for several minutes. When I removed the bowl fuel was still flowing through the shut off valve. I found the nut that the stem of the valve handle goes through was loose but when I tightened it, the valve would still not close so I'm presently letting about 2-1/2 gallons of fuel flow out of the tank into a bucket. Am I missing something here about the fuel shutoff valve or about the compression couplings?

Thanks, Don in Eau Claire

souNdguy · Jun 29, 2012

this would be a great question for the ford forums!

Also.. that's not a compression fitting unless it's a custom job.. should be flare.

things like dope and tape can pake it leak.

I HAVE used a oring to jimmy a stubborn fitting before.. but it should not be necescary if the flare is not cracket or the base metal in the tap is not mared.

as for not shutting off.. if a brass on brass valve, take apart and lap it.. if an oring style valve.. put a new oring on the needle. some have packing behind the stem.. tef tape or cotton strind can be used to remake the packing.. felt washers too.. or an oring.. all depends on particular valve type.. age.. etc..

Ray(MO) · Jun 29, 2012

I had that problem once. Best thing to do is replace the whole valve with a new one with the reserve. I don't remember a compression fitting.

Anonymous-0 · Jun 29, 2012

Thanks for replying. The compression fitting is where the fuel line leaves the sediment bowl assembly to go to the carburetor. The sediment bowl assembly is brand new from Davis Tractor parts. The shutoff valve itself on this one serves as the reserve if you turn the handle all the way out. I just may have to return this sediment bowl assembly to Davis.

Anonymous-0 · Jun 29, 2012

Thanks Soundguy,

Am I using the wrong terminology for the fitting with the nut that turns in and seats (compresses) the flare on the fuel line against the exit port on the sediment bowl assembly? If I am, thanks for the correction.

The fuel line is new as is the sediment bowl assembly casting so the casting shouldn't be marred, nor the flare cracked. The joint leaked when I first put it together without tape, but it's useful to know that tape or dope might make the leak worse.

I'll take your suggestion and try the Ford forums and maybe o rings.

Thanks again,
Don

Russ from MN · Jun 29, 2012

Sounds like something made in china!

Anonymous-0 · Jun 30, 2012

I have had this problem with other after market sediment bowls. Sometimes a venting issue or even leaks. I think alot of them are just junk and it is a hit or miss if it will be a good one. Getting one from YT, Steiner, or even TSC, they were all junk at times. If you have a new one and you have to start replacing it with new parts, then it needs to go back and just start with a whole new one. I always try and reuse the original and rebuild it if possible. Good luck

john in la · Jun 30, 2012

The sediment bowl where the line hooks looks like the end of this fitting.

The gas line has a flare on it that matches. When you tighten it up the two flares match sealing the connection. Pipe dope or tape does not help the seal because the threads are not the sealing point.

A compression fitting uses a ferrule that slides on the tubing.

If your sediment bowl and line are both new you have bad parts. Send them back and get replacements.

Ozlander · Jun 30, 2012

Naa tanks sometimes have crud in them. A little speck of dirt/rust will keep the valve from closing completely. Try taking the valve apart and cleaning it.

souNdguy · Jun 30, 2012

a compression fitting is for joining, say.. 2 square cut pipes using a ferroule on each pipe and a union that has machined seats and nuts with seats. the ferroule is compressed to seal agains the pipe OD, and into the set in the fitting.

a flare fitting packing nut forces the flare to seat agaist the seat in the fitting.. thus thread pucky is useless.. though in some special cases you can use tape or an oring on a flare as packing.. sometimes.. if you know waht you are doing.

most cases of new flare fittings leaking, if there is no crack marring, or ill fittment ( wrong angle or bent flare ).. is because there was tension on the line and it did not fit against the seat correctly when the backing nut was tightened..

NEsota · Jun 30, 2012

I replaced this same assembly recently with a new one from a fleet type farm supply store, it was defective in that the rubber bowl gasket, was too hard to seal the bowl, all of assembly will be returned.

1953 NAA fuel problem

Anonymous-0

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souNdguy

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Ray(MO)

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Anonymous-0

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Anonymous-0

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Russ from MN

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Anonymous-0

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john in la

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Ozlander

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souNdguy

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NEsota

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