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Old 09-21-2013, 04:22 PM   #1
ken-r-mer
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Default Looking for a compression fitting

Decided to run nice looking 5/16" copper fuel lines between the pair of Stromberg 97"s and the mechanical fuel pump. Got the lines formed but ... I also want to do compression fittings instead of flared ends for the copper lines.

Searched high and low and can't find a fitting w/ a 5/16" compression fitting on one end and a male 3/8" SAE 20 threads/inch on the other end. The 3/8" SAE fitting is what is on the fuel inlet of the Strombergs. I can find npt but thats 18 threads per inch. Need the SAE 20 threads/inch male end.

Anybody know of such a fitting?
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Old 09-21-2013, 04:38 PM   #2
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Default Re: Looking for a compression fitting

Is this what you are looking for? http://www.thehotrodcompany.com/shop...oduct_id=9081K
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Old 09-21-2013, 04:46 PM   #3
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Default Re: Looking for a compression fitting

Try Edelmann fittings. My Carquest guy carries them. I would think 1/4" would work fine. JMO

http://www.plews-edelmann.com/search...h=AND&F_Sort=2

http://www.plews-edelmann.com/compression-fittings/

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Old 09-21-2013, 06:12 PM   #4
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Default Re: Looking for a compression fitting

First of all, your looking for the wrong thing. The inlet size is 1/2"-20. I can supply you with the fittings. Give me a holler.
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Old 09-21-2013, 06:24 PM   #5
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Default Re: Looking for a compression fitting

Like John said all you need is 1/4" line,NO advantage to using 5/16". Fittings are availible. ken ct.
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Old 09-21-2013, 06:29 PM   #6
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Default Re: Looking for a compression fitting

illegle to use copper lines for fuel
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Old 09-21-2013, 06:42 PM   #7
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Default Re: Looking for a compression fitting

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illegle to use copper lines for fuel
Think you have it wrong, believe it's for brake lines.
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Old 09-21-2013, 06:45 PM   #8
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Default Re: Looking for a compression fitting

"Illegle" (sp.). Now where in the world did you hear that? Looks like we are all going to jail. LOL
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Old 09-21-2013, 06:46 PM   #9
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Default Re: Looking for a compression fitting

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illegle to use copper lines for fuel
Since when and where is it illegal. Have copper gas line from tank to carb for over 20 yrs now no problems yet. Ken ct OMO.
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Old 09-21-2013, 06:48 PM   #10
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Default Re: Looking for a compression fitting

Thought I heard that if ya read it on the internet, it must be TRUE! DD
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Old 09-21-2013, 06:49 PM   #11
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Default Re: Looking for a compression fitting

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Think you have it wrong, believe it's for brake lines.
You got it right 36RGTOP. Brake lines . ken ct.
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Old 09-21-2013, 07:57 PM   #12
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Default Re: Looking for a compression fitting

If I was going to use copper for fuel lines,which I wouldn't, I would much rather use flared fittings over compression fiitings. JMO. To each his own.
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Old 09-21-2013, 08:04 PM   #13
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Default Re: Looking for a compression fitting

I liked to use the cad plated brake lines. I use the brake line nut and use a copper compression ferrel. I have done this since 1960 on all my carb lines.
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Old 09-21-2013, 10:49 PM   #14
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Default Re: Looking for a compression fitting

LOL im old and not very literate, but show me one car that has a copper fuel line, all fuel lines are steel from the tank to the carb, take any car to have it saftey inspected and it wont pass using copper fuel lines
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Old 09-21-2013, 11:10 PM   #15
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Default Re: Looking for a compression fitting

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Originally Posted by ford3 View Post
LOL im old and not very literate, but show me one car that has a copper fuel line, all fuel lines are steel from the tank to the carb, take any car to have it saftey inspected and it wont pass using copper fuel lines

You must not get out much. Copper fuel lines have been used since the 40's and are still used quite frequently today. And yes, they are legal.
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Last edited by Dick's Hot Rod Place; 09-22-2013 at 11:16 AM.
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Old 09-22-2013, 03:44 AM   #16
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Default Re: Looking for a compression fitting

I've always been taught copper is fine, but put a twist in a long run to allow for expansion and clip pipe properly to stop it vibrating, as it work hardens then cracks.
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Old 09-22-2013, 04:35 AM   #17
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Default Re: Looking for a compression fitting

I can only reiterate what has been said before. Use 1/4". Copper or steel, it all works. You can buy a 1/4" compression tee fitting to split the feed from one carb to two. 1/4" pipe will flow more than enough fuel for a flathead.

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Old 09-22-2013, 09:04 AM   #18
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Default Re: Looking for a compression fitting

5/16" OD= 1/4" ID. Which measurement is being referenced when talking about line size
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Old 09-22-2013, 09:45 AM   #19
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Default Re: Looking for a compression fitting

Quote:
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I've always been taught copper is fine, but put a twist in a long run to allow for expansion and clip pipe properly to stop it vibrating, as it work hardens then cracks.
Electrolysis also comes into play if not properly insulated .
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Old 09-22-2013, 01:20 PM   #20
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Default Re: Looking for a compression fitting

Most of the old stuff had copper plated steel. The copper plating was excellent to prevent rapid corrosion. This is what FoMoCo used back in the day. Copper fatigues faster than steel under vibration stresses. It will still last a long time but it isn't used at all in aviation for the fatigue factor. 5052 aluminum tube and stainless steel tube are the common types used there.

Copper tubing generally always has some service loops turned into it to absorb vibrations a bit better and lessen it's chances of fracturing as Tom Walker previously mentioned.
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Old 09-22-2013, 02:00 PM   #21
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Default Re: Looking for a compression fitting

Just went out and looked through my fittings, found nothing with 3/8 or 1/2 straight male thread, 97s must use gasket of some sort. I did find several 5/16 hex compression nuts, two of them are stainless steel. If these would help you, PM me.
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Old 09-22-2013, 02:18 PM   #22
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Default Re: Looking for a compression fitting

I think I found the fitting. Another poster above referenced Edelman fittings but I didn't see the fitting you appear to need on his links to Edelman. I googled 1/2-20 male/5/16 compression and the Edelman site came up with the following. No specs., but looks like your description. Good luck:
http://www.oreillyauto.com/site/c/de...1163&ppt=C0248
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Old 09-22-2013, 02:38 PM   #23
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Default Re: Looking for a compression fitting

Rotorwrench has it right. Copper work hardens, and heat/cool cycles don't help either. What you see is copper, yes, but only skin deep. Steel is copper plated, then rolled to make the tubing, and brazed to make the seal. Bundy Tube has been manufacturing this product since the early thirties. There is even a name for the brazing process, called Bundywelding. Ain't Wiki great?
You could still get the correct tubing, still with a 91A part number, from any Ford Dealer Parts Department up until sometime in the '90's. Today, it is available from dealers such as C&G and Nazewicz.
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Old 09-22-2013, 06:40 PM   #24
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Default Re: Looking for a compression fitting

I've found the 1/4" o.d. tubing compression fittings w/ the sae 20 treads - no problem. Just can't find the 5/16". Might have to just redo the setup in 1/4". Or just compitulate to doing the flared fittings.

For those of you concerned about the copper tubing, its just between the stock fuel pump and the carbs.

I bought the pressure gauge (0-15 psi) and block from a holly double pumper setup on Ebay for $12. I cut the 3 lines off, had the chrome removed and will scuff the nickel and paint the block of metal to match the bronze fittings.

This is the proposed setup (dryfit before soldering the lines into the pressure gauge block, smoothing out the dings in the lines, and before either using the compression fittings or flaring the ends). Will clean the lines once the blemishes are addressed and will hit the lines w/ copper cleaner till its like a new penny, then will clearcoat the lines.

Also note, I trimmed the Offenhauser gasket to fit the manifold footprint. Can't understand why none of the intake manifold gaskets are in the shape of the intake manifold (stock or aftermarket).
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Last edited by ken-r-mer; 09-22-2013 at 08:10 PM.
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Old 09-22-2013, 07:07 PM   #25
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Default Re: Looking for a compression fitting

Unfortuantely the edelmann fittings are npt (pipe threads) or 18 threads per inch. SAE threads are 20 threads per inch. Wish the NPT and SAE people would have compared notes about 100-120 yrs ago.

Last edited by ken-r-mer; 09-22-2013 at 07:22 PM.
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Old 09-23-2013, 03:42 PM   #26
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Default Re: Looking for a compression fitting

I like it.A little more info on the fuel block if possible, maybe a pict before you cut the lines off

Thanks
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Old 09-23-2013, 04:47 PM   #27
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Default Re: Looking for a compression fitting

Model A Bill....Go on ebay and type "holley 4150 double pumper plus".
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Old 09-24-2013, 07:10 AM   #28
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Default Re: Looking for a compression fitting

Henry Ford used steel tube for fuel lines. For those with copper fuel lines, and V... Lock, there is a lesson here.
Pipe fittings and tubing is usually sized by the tube bore (relating to its ability to carry a certain volume)
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Old 09-24-2013, 08:25 AM   #29
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Default Re: Looking for a compression fitting

Quote:
Originally Posted by joe plumber View Post
5/16" OD= 1/4" ID. Which measurement is being referenced when talking about line size
Quote:
Originally Posted by joe plumber View Post
Electrolysis also comes into play if not properly insulated .
O.D. is used when talking about automotive as well as other applications.
I.D. is used when talking about household plumbing ( but you should know that)
Have never heard of electrolysis being an issue in any automotive application.
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