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Username Post: Gas leak        (Topic#358415)
PLS 
"7th Year" Silver Supporting Member
Posts: 1453
PLS
Loc: Smyrna, Georgia
Reg: 06-07-12
10-11-19 12:54 PM - Post#2777677    

I am having a problem with a gas leak on the carb where the line goes into it. (circled). I had problems with it before and tightened both fittings and it stopped for a while then started back. I tried to find the red gasket between the carb and the first fitting with no luck and went to the local hardware store and in their plumbing stuff I found one exactly like it, size and even material and it has worked until today and again the gas seeps out Finding the red gasket at a local parts store is fruitless or at least the ones around me. Anyone have any suggestions? There is a CT member that has something in his avatar about carburetors but on a short look I didn't come up with him. Thank you in advance for any help that you could give me. Lamar

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busdriver 
Contributor
Posts: 287

Loc: Madrid IA
Reg: 05-26-02
10-11-19 02:34 PM - Post#2777682    
    In response to PLS

you are looking for carbking. did you try any teflon tape on the threads?

Todd
1960 nomad


 
PLS 
"7th Year" Silver Supporting Member
Posts: 1453
PLS
Loc: Smyrna, Georgia
Reg: 06-07-12
10-11-19 02:51 PM - Post#2777683    
    In response to busdriver

That's him!!! Thank you!!! I haven't tried the tape route. It's my understanding that those threads aren't tapered and the sealing comes from the seal/washer between the mating surfaces but I will try that tomorrow and also try to get in touch with carking, will let you know how it goes. Again thank you, Lamar


Hey Todd, I just looked him up to send him a PM and guess what, I sent him a PM on 4-30-19 with that exact question and I never did get any response so I didn't try again. I will go the tape route tomorrow.



Edited by PLS on 10-11-19 02:57 PM. Reason for edit: No reason given.

 
1belair1954 
Contributor
Posts: 100

Reg: 12-24-12
10-11-19 04:36 PM - Post#2777689    
    In response to PLS

Not sure if teflon tape and fuel are a good combination probably would use a thread sealer i use this stuff on my truck Hydraulics works really well its fuel resistant. Maybe also try a copper sealing washer instead of the one you have
https://www.permatex.com/products/thread-compo unds...

The red plumbing sealing washers that you used do not work i once used them for a sump plug washer and they leak after a while . Maybe go to your parts store and ask for a sump plug washer i am sure you should be able to find one the right size for your fuel fitting.



Edited by 1belair1954 on 10-11-19 04:40 PM. Reason for edit: No reason given.

 
cahartley 
Contributor
Posts: 368

Loc: Central Wisconsin
Reg: 01-16-14
10-11-19 09:33 PM - Post#2777707    
    In response to 1belair1954

Those red washers are just plain too hard.
They could just as well be steel.
A copper or brass washer with the fiber washer would do the trick.

www.youtube.com/cahartley7


 
DonSSDD 
Silver Supporting Member
Posts: 7196
DonSSDD
Loc: Nova Scotia, Canada
Reg: 08-21-01
10-11-19 11:29 PM - Post#2777708    
    In response to cahartley

Try carbking on his web site, The Carburetor Shop, in Missouri. There is a yellow Teflon tape for
Fuel use.

63 Pontiac Parisienne Sport Coupe(CDN Chev mechanically (409, 4 speed),62 Bel Air SC (sold), 59 El Camino (sold), 62 Bel Air SC(sold), 63 SWC Vette (sold),
Member #2194


 
PLS 
"7th Year" Silver Supporting Member
Posts: 1453
PLS
Loc: Smyrna, Georgia
Reg: 06-07-12
10-12-19 10:48 AM - Post#2777733    
    In response to PLS

Thanks guys for your help. I tried to find a copper seal washer but with no luck. They have the small ones but nothing as big as I needed so I used the yellow Teflon tape and really loaded it on before and after I put the red washer on and so far it hasn't leaked any yet but I only put about 10 miles on it. We'll see. Thank you very much and if it starts to leak I will get in touch with carbking. Lamar

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Chair City 
Contributor
Posts: 492
Chair City
Loc: Thomasville, NC USA
Reg: 01-24-04
10-12-19 12:19 PM - Post#2777737    
    In response to PLS

Lamar, Advance Auto lists a carburetor inlet gasket assortment for $2.99. Part No. 55143 on their site. Might check with them if you have a store near you

1960 Impala Spt. Cpe. Now in my son's garage


 
59cheviac 
Contributor
Posts: 731

Loc: the sunshine state
Reg: 10-31-03
10-13-19 03:08 AM - Post#2777764    
    In response to Chair City

https://www.carburetor-parts.com/Rochester-Fuel-In...



 
PLS 
"7th Year" Silver Supporting Member
Posts: 1453
PLS
Loc: Smyrna, Georgia
Reg: 06-07-12
10-14-19 01:33 PM - Post#2777884    
    In response to PLS

Thanks guys for the information. I know that this information didn't just pop up in your head, you had to look it up and for that I am grateful! I ordered the ones at Advance Auto this afternoon even though there isn't much information as to what they are made of. I checked the other ones out and I like that they are metal with a rubber coating but they want 4 buck to ship it. So far the yellow tape had done the trick after about 25 miles but I will have to keep an eye on it. Again thank you very much. Lamar



 
PLS 
"7th Year" Silver Supporting Member
Posts: 1453
PLS
Loc: Smyrna, Georgia
Reg: 06-07-12
10-16-19 06:41 AM - Post#2778019    
    In response to PLS

Got the inlet gaskets yesterday at Advance Auto. The red ones seem to be just like the one that is on the carb now. If it leaks again I will try one of the white gaskets that's in the package. Thanks again for you help. Lamar

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beagrizzly 
"11th Year" Gold Supporting Member
Posts: 2095
beagrizzly
Age: 69
Loc: south texas
Reg: 08-04-12
10-17-19 06:32 AM - Post#2778093    
    In response to PLS

Teflon tape will only make it easy to strip the threads in the carburetor.
Have you tried getting a new fitting? It might come with a new gasket. It looks like yours has been tightened with an adjustable wrench one too many times.
Always use a box end wrench. You won't round off the hex.

Griff

if you're gonna be a bear..................

1960 Biscayne (the 6T)
2005 Yukon XL
2007 GMC Sierra Classic 8.1
2009 Silverado
2011 Escalade ESV


 
junky 
Valued Contributor
Posts: 3159

Loc: Northeast CT
Reg: 06-27-10
10-18-19 05:04 PM - Post#2778207    
    In response to PLS

OK... you are forcing my hand at giving up my secret fixes. There are leaks that are a result of contact surface irregularities, and then there are leaks as a result of fuel getting past the threads. Over tightening of the fuel nut is going to cause you to have thread damage and ultimately leaks. The red gasket is only to take care of minor surface irregularities, and the threads should be sufficient to hold the nut tight. It appears that the nut has seen some rough handling. In these cases, I use Permatex gasket shellac and about 8 - 12 inches of thin cotton threads wound over the nuts threads starting at the back, working towards the front, in the direction that the nut is going to be inserted into the carburetor. You don't want the thread unwinding as you install it! This will take up the space in the threads that the gasoline is seeping through. It just might be that the gasket was good, but the threads are worn out. Also, always use an open end tubing wrench to tighten the nut and the fuel line nut. If you don't have a large enough tubing wrench for the nut, then cut a section out of an old box wrench, and make your own. I have seen many carburetors reduced to junk by damaging the fine threads in the top housing. The only reason to remove that nut, is to service the filter behind it, and that filter doesn't need servicing that often. If it is getting clogged frequently, then your fuel tank needs cleaning.

Never argue with an idiot. He'll drag you down to his level, then beat you with experience.


 
PLS 
"7th Year" Silver Supporting Member
Posts: 1453
PLS
Loc: Smyrna, Georgia
Reg: 06-07-12
10-19-19 12:18 PM - Post#2778247    
    In response to junky

Hey junky, I know your kind. No one is forcing you to help with fixes because when someone needs help you just simply can’t not help and that’s what’s so great about this forum and your help along with many others here on CT is the only reason my car is at the point that it is today. And as a matter of fact, speaking of today my ‘60 is sitting at Tyler Perry Studio in Atlanta after I was invited to enter it in the Atlanta Concours d’elegance car show this weekend. Today was a complete rain out and I didn’t put it on the field but tomorrow it is supposed to be really nice and tomorrow is the big day anyway and we will see how it goes. Now to the carb leak. Griff noticed the evidences of the incorrect tool used on the nut in the past. I’m not sure if I created all of the bad places on the nut or not but probably did and back then I didn’t have a good assortment of tools so I may have used a pipe wrench, who knows. I am pretty certain that this is not the original carb and when I had it rebuilt, I’m assuming that they reinstalled the nut that was on the carb when I took it to them. It didn’t start leaking until I had driven probably 500 miles and then only seeped out and I didn’t bare down on it when tightening and the “fix” is still working and if it starts back, I will do as you suggested. Thank you, guys, for all of your help. Lamar



 
MarkISS 
"2nd Year" Platinum Supporting Member
Posts: 133
MarkISS
Loc: Brevard, NC
Reg: 05-14-18
10-21-19 02:42 AM - Post#2778376    
    In response to PLS

what about an o-ring?

Mark - Brevard, NC - 66 Impala SS RestoMod
My detailed build thread link: chevyta.lk/66SSResto


 
fmolnar427 
Silver Supporting Member
Posts: 590
fmolnar427
Age: 54
Loc: Ontario,Canada
Reg: 10-06-07
10-21-19 07:27 AM - Post#2778402    
    In response to PLS

I have used teflon tape , works...you can get it in liquid form.
Specially when these carbs get rebuilt smd festooned up..every spring.

Big,Bad,B -bodies Rule!!
66 Impala SS 327/2sp power glide
http://www.picturetrail.com/sfx/album/view/240425 5...


 
62chevy427 
"12th Year" Silver Supporting Member
Posts: 2166
62chevy427
Loc: laurens sc
Reg: 04-13-06
10-21-19 08:53 AM - Post#2778415    
    In response to MarkISS

if o ring comes in contact with gas it wil deteriorate

56 bel air ((since 2002)
62 impala ss (since 1965)
65 el camino (since 1969)
66 nova (since 1987)
67 malibu convertible (since 1981)
72 el camino ss454 (since 1985)
83 gmc 4wd (since 1991)
95 impala (new)
15 chevy equinox



 
Richard Ochoa 
Poster
Posts: 2

Reg: 04-15-19
10-21-19 09:44 AM - Post#2778423    
    In response to junky

Try a New Nut. Looks like the same Rochester 2 barrel that'a on wife's '61 Impala. I've had the same problem. I happened to have had a few extra parts carbs & took the top off of one & used it along with a new Fuel Pump to Carb. line with new nut! Problem Solved! Good Luck! Richard



 
MarkISS 
"2nd Year" Platinum Supporting Member
Posts: 133
MarkISS
Loc: Brevard, NC
Reg: 05-14-18
10-21-19 10:33 AM - Post#2778428    
    In response to 62chevy427

  • 62chevy427 Said:
if o ring comes in contact with gas it will deteriorate



Maybe rubber ones, but they do make gas proof o-rings

Mark


Mark - Brevard, NC - 66 Impala SS RestoMod
My detailed build thread link: chevyta.lk/66SSResto


 
Slow Train 
Poster
Posts: 6

Loc: Salt Spring Island, B.C.
Reg: 04-18-19
10-21-19 12:55 PM - Post#2778440    
    In response to PLS

those line wrenches are called "flare nut wrenches". I just put a new air horn (carb top section) on my Rochester B, Post '52 single barrel.

The threads for the brass inlet pipe thread fitting were stripped and years ago I epoxied the fitting in with Locweld. It worked for years but I was getting weeping this time around, or so I thought, so I put another air horn together.

Two things I discovered:
My needle seat wasn't tight enough and I had used a pre 1952 Rochester B air horn gasket which didn't have the width of gasket at the fuel end of the bowl so it was weeping.

anyway . . . here's a tip.
So that one can crank the steel line fitting super tight one has to stop the carb fitting from moving at all. In my case, my 235 is in a van so I put an open end wrench on the brass fitting and the wrench leans against the top of the wall of
my engine surround. So now, with my flare nut wrench I can get max tightness on the steel line in fitting without disturbing or changing, or overtightening, the carb inlet fitting.



 
chronamyd 
Poster
Posts: 50

Loc: Nanoose Bay BC Canada
Reg: 05-02-12
10-21-19 02:50 PM - Post#2778452    
    In response to 1belair1954

If I remember correctly their ie a round plastic gasket that goes in the rear of the hole behind the 1” fitting . Thanks Dwight



 
Richard Ochoa 
Poster
Posts: 2

Reg: 04-15-19
10-21-19 09:05 PM - Post#2778480    
    In response to Slow Train

I need some good advice on mounting an Original PB Pedal on my '56 B.A. Changing from standard to Power Brakes. The PB Pedal assembly has 2 mounting holes on each side of the bracket. Firewall has no holes to match the holes on the PB assembly. Where & How do I know to Mount that bracket??? Any specific help much appreciated! Thanks a bunch, Richard



 
Jalapeno 
Senior Member
Posts: 9818
Jalapeno
Loc: The Republic of Texas
Reg: 04-30-00
10-22-19 07:12 AM - Post#2778505    
    In response to Richard Ochoa

  • Richard Ochoa Said:
I need some good advice on mounting an Original PB Pedal on my '56 B.A. Changing from standard to Power Brakes. The PB Pedal assembly has 2 mounting holes on each side of the bracket. Firewall has no holes to match the holes on the PB assembly. Where & How do I know to Mount that bracket??? Any specific help much appreciated! Thanks a bunch, Richard



Welcome Richard!

You should probably start a new thread with your question, you'll get a better response that way.

Jalapeno


 
PLS 
"7th Year" Silver Supporting Member
Posts: 1453
PLS
Loc: Smyrna, Georgia
Reg: 06-07-12
10-22-19 03:56 PM - Post#2778534    
    In response to PLS

I want to thank all of you for your help!! The remedy that I used is still working as of now but if it should restart in the future I have a ton of help here and I will try the suggestions. Lamar



 
herbieraye51 
Silver Supporting Member
Posts: 3
herbieraye51
Age: 63
Loc: Delano Tennessee
Reg: 12-18-14
11-11-19 10:38 AM - Post#2779978    
    In response to PLS

I had the same problem, the threads were starting to ware and strip so I put one round of around the fitting and then covered it with head bolt sealant tightened it down and it didn't leak anymore you might try this



 
ragtp66 
Contributor
Posts: 812
ragtp66
Reg: 12-09-07
11-12-19 06:08 PM - Post#2780075    
    In response to PLS

Give Ron at Daytonaparts.com a call he will more than likely have both the gasket as well as a new fuel inlet nut if you need it. 386-527-2515

Toys:
1958 Impala 2dr Hardtop Under Construction
1966 Chevelle Malibu Convert M20/350 Aztec Bronze
1987 Sea Ray Pachanga 22
2002 Cadillac Escalade EXT Parts chaser
2007 Trailblazer SS -gone and missed


 


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