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six pack fuel leak at carb
#1028129
07/08/11 12:29 AM
07/08/11 12:29 AM
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Joined: May 2005
Posts: 907
Mississauga, Canada
KARLN
OP
super stock
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OP
super stock
Joined: May 2005
Posts: 907
Mississauga, Canada
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I had a fuel leak on my outer six pack carb at the fuel inlet fitting. I changed the fitting and installed a new line. Now I have a fuel leak at the other end that goes into the metal block. When I removed and reinstalled it started leaking at the fuel inlet fitting again.
Any ideas on how to fix this leak?
B5 Challenger T/A
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Re: six pack fuel leak at carb
[Re: KARLN]
#1028130
07/08/11 07:21 AM
07/08/11 07:21 AM
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Joined: Dec 2007
Posts: 18,157
Mass
DAYCLONA
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 18,157
Mass
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apply a thin film of liquid teflon to the threads before assemble,....NO TAPE, and use a proper TUBING WRENCH, a reqular wrench will distort/egg the line fittings the tighter you tighen the fitting, just making the leak worse
Last edited by DAYCLONA; 07/08/11 07:24 AM.
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Re: six pack fuel leak at carb
[Re: DAYCLONA]
#1028131
07/08/11 12:42 PM
07/08/11 12:42 PM
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Joined: May 2005
Posts: 907
Mississauga, Canada
KARLN
OP
super stock
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OP
super stock
Joined: May 2005
Posts: 907
Mississauga, Canada
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thanks for the suggestion. I hope this solves this frustrating fuel leak issue.
B5 Challenger T/A
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Re: six pack fuel leak at carb
[Re: KARLN]
#1028132
07/08/11 04:43 PM
07/08/11 04:43 PM
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Joined: Mar 2007
Posts: 3,285
West Coast, USA
jbc426
master
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master
Joined: Mar 2007
Posts: 3,285
West Coast, USA
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I often get rid of small fuel and brake line leaks at inverted flare fittings by tightening, loosening, and tightening several times. I assume it kind of seats the mating surfaces together. Don't over-tighten.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: six pack fuel leak at carb
[Re: FJ5_Fish]
#1028134
07/08/11 07:34 PM
07/08/11 07:34 PM
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Joined: May 2005
Posts: 907
Mississauga, Canada
KARLN
OP
super stock
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OP
super stock
Joined: May 2005
Posts: 907
Mississauga, Canada
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thanks for all the suggestions.
I've installed these lines many times and never had an issue in the past. This time is different. I had a spare OEM line kit so I've installed a new inlet fitting on the carb and installed a new line. I've been careful to use line wrenches, hold the brass fitting and not overtighten but can't seem to stop the leak.
It seems to stop at the carb end and start at the block end.
I'm going to grind down the wrench to hold the inlet fitting and try installing again
B5 Challenger T/A
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Re: six pack fuel leak at carb
[Re: KARLN]
#1028136
07/09/11 12:36 PM
07/09/11 12:36 PM
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Joined: Aug 2003
Posts: 8,828
Houston, Tx
hemi68charger
master
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master
Joined: Aug 2003
Posts: 8,828
Houston, Tx
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With all my years owning six packs, one of the most important aspects on installation is getting all the fittings started first. Then, rotate around and tighten them up. I never mess around with screwed up fittings/lines. I have used fuel resistant teflon tape in the past and it helps. But, again, the biggest thing is getting all the fittings started everywhere then rotating around tightening them..
TroyHouston Mopar Connection Club'69 Charger Daytona 440 - auto - 4.10 Dana (now with 426 hemi) '69 Charger 500 440 - 4speed - 3.54 Dana '70 Road Runner 383 - 4speed - a/c (now with 440)
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Re: six pack fuel leak at carb
[Re: topside]
#1028138
07/09/11 02:33 PM
07/09/11 02:33 PM
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Joined: Aug 2003
Posts: 8,828
Houston, Tx
hemi68charger
master
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master
Joined: Aug 2003
Posts: 8,828
Houston, Tx
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Quote:
We make & sell a 1" wrench specifically for Holleys; the ends are clocked so they clear everything including the firewall, and they're hardened.
Got tired of trying to make normal wrenches, which are too thick, too large, and too long, work for that job.
$22.00 + $3.00 shipping.
Another thing and this brings to light, always use a 1/2" line-wrench. You'll be happy you did. You could always use a regular 1/2" to start things, but do the final fastening with the line wrench.
TroyHouston Mopar Connection Club'69 Charger Daytona 440 - auto - 4.10 Dana (now with 426 hemi) '69 Charger 500 440 - 4speed - 3.54 Dana '70 Road Runner 383 - 4speed - a/c (now with 440)
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Re: six pack fuel leak at carb
[Re: KARLN]
#1028140
07/10/11 07:35 PM
07/10/11 07:35 PM
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Joined: May 2005
Posts: 907
Mississauga, Canada
KARLN
OP
super stock
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OP
super stock
Joined: May 2005
Posts: 907
Mississauga, Canada
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tried all your suggestions and still have the fuel leak. Now its on the block end where the fuel line treads in. I've loosened off all the fittings, installed and tighten each one equally, holding the block with a wrench.
Only thing I haven't done is put any sealant on the treads.
This issue is holding me up from completing my T/A and getting it on the road.
Any other suggestions would be greatly appreciated.
B5 Challenger T/A
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Re: six pack fuel leak at carb
[Re: 62maxwgn]
#1028142
07/10/11 09:53 PM
07/10/11 09:53 PM
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Joined: May 2005
Posts: 907
Mississauga, Canada
KARLN
OP
super stock
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OP
super stock
Joined: May 2005
Posts: 907
Mississauga, Canada
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I'm sure the new line kit I installed was SS. I guess I'll have to order a new set.
B5 Challenger T/A
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Re: six pack fuel leak at carb
[Re: 62maxwgn]
#1028144
07/10/11 10:12 PM
07/10/11 10:12 PM
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Joined: Dec 2007
Posts: 18,157
Mass
DAYCLONA
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 18,157
Mass
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Quote:
Yes,if you have stainless lines,get rid of them,other than that you're on you own.
I've plumbed plenty of six pack cars with steel or stainless, as well as braided SS/AN fittings, never had a leak issue with either that couldn't be solved in under 10 minutes,.....again the OP has tried everything BUT liquid teflon on the threads, esp if he has SS lines, the teflon won't "hurt" the carbs....
FYI I run nothing BUT stainless fuel/emmission/brake lines on my personal sixpack cars,....Sorry, but I can't fathom the issues I read about on this board regarding line leaks 
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Re: six pack fuel leak at carb
[Re: DAYCLONA]
#1028145
07/11/11 12:48 AM
07/11/11 12:48 AM
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Joined: Jan 2003
Posts: 75,043
U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 75,043
U.S.S.A.
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Quote:
Quote:
Yes,if you have stainless lines,get rid of them,other than that you're on you own.
I've plumbed plenty of six pack cars with steel or stainless, as well as braided SS/AN fittings, never had a leak issue with either that couldn't be solved in under 10 minutes,.....again the OP has tried everything BUT liquid teflon on the threads, esp if he has SS lines, the teflon won't "hurt" the carbs....
FYI I run nothing BUT stainless fuel/emmission/brake lines on my personal sixpack cars,....Sorry, but I can't fathom the issues I read about on this board regarding line leaks
Mike , you are a very sharp guy but I can't figure this one out , does putting the thread sealant on the threads help the nut get tighter ? The reason I ask is because on this type of connection the threads are not the seal point , the flare on the line and the block the line is screwed into are the parts that make the seal .
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Re: six pack fuel leak at carb
[Re: JohnRR]
#1028146
07/11/11 06:36 AM
07/11/11 06:36 AM
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Joined: Dec 2007
Posts: 18,157
Mass
DAYCLONA
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 18,157
Mass
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Quote:
does putting the thread sealant on the threads help the nut get tighter ? The reason I ask is because on this type of connection the threads are not the seal point , the flare on the line and the block the line is screwed into are the parts that make the seal .
John in your own often used words,...."Ding Ding Ding, we have a winner!"  ....Ih the plumbing world, thread/pipe dope/sealant, which ever you prefer to call it, has one task, to lubricate the threads, esp dissimilar mat'l, and ESP STAINLESS STEEL, prevents galling the threads, if you don't gall the threads, you can achieve a seal on NPT, or inverted flair, bubble flair/etc/etc or compression fittings by extending the thread travel and allowing the fitting to perform it's mechanical seal, regardless of the type of seal involved,...the OP probally has wrenched the piss out of the lines by now,....probally will need a new set,....this falls under the ol'sayin,..."A little dab, will do ya".....
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Re: six pack fuel leak at carb
[Re: DAYCLONA]
#1028147
07/11/11 09:35 AM
07/11/11 09:35 AM
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Joined: Jan 2003
Posts: 9,436
Blair County,PA
62maxwgn
master
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master
Joined: Jan 2003
Posts: 9,436
Blair County,PA
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Quote:
Quote:
Yes,if you have stainless lines,get rid of them,other than that you're on you own.
I've plumbed plenty of six pack cars with steel or stainless, as well as braided SS/AN fittings, never had a leak issue with either that couldn't be solved in under 10 minutes,.....again the OP has tried everything BUT liquid teflon on the threads, esp if he has SS lines, the teflon won't "hurt" the carbs....
FYI I run nothing BUT stainless fuel/emmission/brake lines on my personal sixpack cars,....Sorry, but I can't fathom the issues I read about on this board regarding line leaks
Mike.I've used both over the years (and a lot) and never had a problem with either one,my bird has stainless,has been apart off and on many times in the last 18yrs and no leaks. (and "never" had to use a sealer of any kind)  The secret if you want to call it that is the correct wrenches and knowing how much to tighten and when to quit.Look at most used fittings,most have the edges rounded from not using line wrenches.I've also had some carbs to restore that had the fitting so tight that the owners cut the fuel line because they couldn't get the nut loose from the inlet fitting.Regular steel lines are a little more forgiving if you don't have the right tools and are unfamiliar with the process.
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Re: six pack fuel leak at carb
[Re: 62maxwgn]
#1028148
07/11/11 11:11 AM
07/11/11 11:11 AM
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Joined: Dec 2007
Posts: 18,157
Mass
DAYCLONA
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 18,157
Mass
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Quote:
Quote:
Quote:
Yes,if you have stainless lines,get rid of them,other than that you're on you own.
I've plumbed plenty of six pack cars with steel or stainless, as well as braided SS/AN fittings, never had a leak issue with either that couldn't be solved in under 10 minutes,.....again the OP has tried everything BUT liquid teflon on the threads, esp if he has SS lines, the teflon won't "hurt" the carbs....
FYI I run nothing BUT stainless fuel/emmission/brake lines on my personal sixpack cars,....Sorry, but I can't fathom the issues I read about on this board regarding line leaks
Mike.I've used both over the years (and a lot) and never had a problem with either one,my bird has stainless,has been apart off and on many times in the last 18yrs and no leaks. (and "never" had to use a sealer of any kind) The secret if you want to call it that is the correct wrenches and knowing how much to tighten and when to quit.Look at most used fittings,most have the edges rounded from not using line wrenches.I've also had some carbs to restore that had the fitting so tight that the owners cut the fuel line because they couldn't get the nut loose from the inlet fitting.Regular steel lines are a little more forgiving if you don't have the right tools and are unfamiliar with the process.
I agree with you Bill,...I don't have any issues either, I've been "wrenching" for a living and hobby for the last 35+ years, you learn the ends and outs of what/what not to do, In regards to a sealer it's more of a thread lubricant on a compression/flare to prevent thread gall, which if not used IMHO can kill not just the threads, but prevent a good compression on the mechanical seal.. 
Mike
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