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New Six pack fuel lines leaking #2354484
08/15/17 09:50 PM
08/15/17 09:50 PM
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Maryland
glenngomango Offline OP
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I recently repaired the center carb on a 70 Cuda so I replaced the metal fuel lines with a repro set. I decided to use the original brass fuel blocks because the repro didn't look correct. After tightening and re-tightening all the fittings from the carbs to the fuel blocks, they are still leaking. Is there a lube or trick to prevent the fittings from leaking gas?

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Re: New Six pack fuel lines leaking [Re: glenngomango] #2354485
08/15/17 09:55 PM
08/15/17 09:55 PM
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Michigan
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A727Tflite Offline
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If stainless lines you need to cinch them and loosen them multiple times. I have even seen that on plain steel lines. Each time you tighten them go a tad tighter. I just went through this again on my maxwedge lines.

Re: New Six pack fuel lines leaking [Re: A727Tflite] #2354498
08/15/17 10:25 PM
08/15/17 10:25 PM
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Posts: 2,364
White Plains, NY
VCODE Offline
top fuel
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Hi Glenn,
This is what you do. Permatex makes a high temp sealant # 59235.
Use this it works. Let it dry for at least a day or two before you run it with gas.
Bob

Last edited by VCODE; 08/15/17 10:25 PM.

Mom & Dad let me buy a brand new 70 Challenger R/T 440 Six-Pack Super Trac Pack when I was 17

(Robert what is a 440 Six-Pack)
Re: New Six pack fuel lines leaking [Re: VCODE] #2354506
08/15/17 10:43 PM
08/15/17 10:43 PM
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up yours
Supercuda Offline
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Originally Posted By VCODE
Hi Glenn,
This is what you do. Permatex makes a high temp sealant # 59235.
Use this it works. Let it dry for at least a day or two before you run it with gas.
Bob


Pretty sure they are flare fittings, in which case sealant is useless.


They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
Re: New Six pack fuel lines leaking [Re: glenngomango] #2354528
08/15/17 11:23 PM
08/15/17 11:23 PM
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Blair County,PA
62maxwgn Offline
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Flare a piece of 5/16" copper tubing,cut off the flare,insert in fuel inlet fitting and no more leaks.

Re: New Six pack fuel lines leaking [Re: 62maxwgn] #2354544
08/15/17 11:52 PM
08/15/17 11:52 PM
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Crook County, ILL
Mastershake340 Offline
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I ran into that issue last year when I was putting my T/A together.
My lines were leaking like crazy at the carbs, and nothing seemed to help, until my engine builder told me to put some grease on the threads before installing the lines. I never thought that would work, but was running out of ideas.
Greased the threads up with red grease, installed and tightened them, fired up the engine, and dry as a bone! thumbs

Re: New Six pack fuel lines leaking [Re: glenngomango] #2354558
08/16/17 12:18 AM
08/16/17 12:18 AM
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Omaha Ne
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TJP Offline
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The seal takes place between the inverted tubing flare and the corresponding "male" flare in the fitting.

If you have done the "loosen / tighten" routine more than 3 or more times, 1. Either the flare on the tube is bad,
2. The nut is bad,
3. The "seat" in the fitting is bad,
4. Or there is debris preventing the seal.

Disassemble, inspect the flare on the tube and seat in the fitting. Your problem should become apparent.

twocents beer

Last edited by TJP; 08/16/17 12:58 PM.
Re: New Six pack fuel lines leaking [Re: TJP] #2354606
08/16/17 01:30 AM
08/16/17 01:30 AM
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Mass
DAYCLONA Offline
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I'll use either a teflon paste or grease to lube the threads so that they help seat the flare and prevent galling of the threads, using a tube wrench instead of a "regular" wrench will also prevent you from "egging" the flare nut causing leaks by making it harder to fully seat the tube nut sealing the flare, stainless or steel

Re: New Six pack fuel lines leaking [Re: glenngomango] #2354657
08/16/17 04:29 AM
08/16/17 04:29 AM
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Northern Calyfornua
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Sxrxrnr Offline
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In spite of all the naysayers,,,,,teflon tape has always been my go to fix for leaky fuel lines. Has worked perfectly on my six pack. Be certain to use correctly and not allow any into fuel line tubing.

Re: New Six pack fuel lines leaking [Re: glenngomango] #2354706
08/16/17 10:17 AM
08/16/17 10:17 AM
Joined: Jun 2006
Posts: 467
Maryland
glenngomango Offline OP
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Thanks for all the Trouble shooting ideas!

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Re: New Six pack fuel lines leaking [Re: glenngomango] #2354708
08/16/17 10:26 AM
08/16/17 10:26 AM
Joined: Jan 2006
Posts: 2,364
White Plains, NY
VCODE Offline
top fuel
VCODE  Offline
top fuel

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Glenn, where did your get that trouble shooting trophy? I was in the 1969 Chrysler/Plymouth contest in New York.
Bob


Mom & Dad let me buy a brand new 70 Challenger R/T 440 Six-Pack Super Trac Pack when I was 17

(Robert what is a 440 Six-Pack)
Re: New Six pack fuel lines leaking [Re: Mastershake340] #2354720
08/16/17 10:59 AM
08/16/17 10:59 AM
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1 Offline
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Originally Posted By Mastershake340
I ran into that issue last year when I was putting my T/A together.
My lines were leaking like crazy at the carbs, and nothing seemed to help, until my engine builder told me to put some grease on the threads before installing the lines. I never thought that would work, but was running out of ideas.
Greased the threads up with red grease, installed and tightened them, fired up the engine, and dry as a bone! thumbs


iagree

Grease or oil is best and should always be used on flare fittings to allow you to get them tight.

IMO never use teflon tape anywhere on a fuel system, never. Because it is near impossible to get all the little pieces out when you take it apart. Plus it looks like sh!t and tells everyone you don't understand flare fittings.

Re: New Six pack fuel lines leaking [Re: glenngomango] #2354800
08/16/17 12:40 PM
08/16/17 12:40 PM
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Ohio
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jlatessa Offline
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AMEN!

Joe

Re: New Six pack fuel lines leaking [Re: Sxrxrnr] #2354866
08/16/17 02:12 PM
08/16/17 02:12 PM
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upstate western ny
sogtx Offline
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Since theres inverted flares on these , the threads dont
Really hold any pressure
Listen to Mr Bill 62 maxwagon
This is the proper way - if you cant titen them properly

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Re: New Six pack fuel lines leaking [Re: sogtx] #2354873
08/16/17 02:22 PM
08/16/17 02:22 PM
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Mass
DAYCLONA Offline
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Originally Posted By sogtx
Since theres inverted flares on these , the threads dont
Really hold any pressure
Listen to Mr Bill 62 maxwagon
This is the proper way - if you cant titen them properly





Generally the use of copper is avoided with gasoline use, as the gasoline with slowly dissolution the copper and actually "plate" the fuel system/carbs/etc with copper thru an electroless process

Re: New Six pack fuel lines leaking [Re: DAYCLONA] #2354878
08/16/17 02:26 PM
08/16/17 02:26 PM
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Omaha Ne
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TJP Offline
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Originally Posted By DAYCLONA
Originally Posted By sogtx
Since theres inverted flares on these , the threads dont
Really hold any pressure
Listen to Mr Bill 62 maxwagon
This is the proper way - if you cant titen them properly





Generally the use of copper is avoided with gasoline use, as the gasoline with slowly dissolution the copper and actually "plate" the fuel system/carbs/etc with copper thru an electroless process


not to mention you have now doubled the sealing surfaces and potential for leaks whistling

Re: New Six pack fuel lines leaking [Re: TJP] #2354983
08/16/17 05:51 PM
08/16/17 05:51 PM
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Blair County,PA
62maxwgn Offline
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Blair County,PA
Originally Posted By TJP
Originally Posted By DAYCLONA
Originally Posted By sogtx
Since theres inverted flares on these , the threads dont
Really hold any pressure
Listen to Mr Bill 62 maxwagon
This is the proper way - if you cant titen them properly





Generally the use of copper is avoided with gasoline use, as the gasoline with slowly dissolution the copper and actually "plate" the fuel system/carbs/etc with copper thru an electroless process


not to mention you have now doubled the sealing surfaces and potential for leaks whistling




Not really,neither of these have leaked with stainless lines since I finished them,the bird in 92 and the other in 2011,both have been apart numerous times,put the lines on and never had a leak problem and I have yet to see any sign of copper plating anywhere.You do as you see fit,I'll stick with what works for me! stirthepot

Picture 346.jpgPicture 156.jpg
Re: New Six pack fuel lines leaking [Re: DAYCLONA] #2355131
08/16/17 10:36 PM
08/16/17 10:36 PM
Joined: Jul 2003
Posts: 5,180
upstate western ny
sogtx Offline
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Show me the time lapse results of the dissolution
of copper when used with gasoline.
There would be a fraction of a zillionth of an inch
exposed on a flare . I m o
These arent space shuttles ..
if you really want ---use a torque wrench on them
And adjust to 29 neuton meters .

I suppose you might still even have some electrolysis
occuring when brass meets steel - if you dont use a non
Conducive type gasket.

Im with the ol timer - use what works ..
lol - im only here to argue

Re: New Six pack fuel lines leaking [Re: sogtx] #2355534
08/17/17 04:29 PM
08/17/17 04:29 PM
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Shopping @ HoBo Fright
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Originally Posted By sogtx
Since theres inverted flares on these , the threads dont
Really hold any pressure
Listen to Mr Bill 62 maxwagon
This is the proper way - if you cant titen them properly

Wow those are kool where can one get them?


[img]https://i234.photobucket.com/albums/ee87/fast340six/sig%20pics/2840886-340SIX-1.jpg[/img]
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73 Dart Sport 340/ 70 challenger vert. That may still get built, If I live long enough
Re: New Six pack fuel lines leaking [Re: glenngomango] #2355624
08/17/17 07:38 PM
08/17/17 07:38 PM
Joined: Jul 2007
Posts: 291
St. Louis
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Imrare Offline
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St. Louis
I will provide my solution to the "leaking lines" on a 6-pack. I resorted to using a small black O-ring that was just small enough to fit inside the Carburetor nut (it the same diameter as the flared fuel line) that the fuel line bolts to. Because the O-ring is actually sealing against the fuel line "flare" and the Carb nut, you can't tighten it real tight like you normally would or it will destroy the O-ring. I tightened it "extra snug". I did this as a "last resort" when I couldn't get my new lines to seal. It has been 2 years since this fix and I haven't had to touch them and they are not leaking.

Last edited by Imrare; 08/17/17 07:40 PM.
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