68 Barracuda, Fuel Tank Vent
#2271973
03/18/17 08:10 PM
03/18/17 08:10 PM
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Joined: Jan 2003
Posts: 8,022
Tulsa OK
Bad340fish
OP
master
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OP
master
Joined: Jan 2003
Posts: 8,022
Tulsa OK
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What all does the fuel tank vent consist of on a 68 barracuda fastback? I see a hose running off of the filler neck, does that just go into the frame rail somewhere?
The car is fuel injected and I have had some fuel heating issues. I have never touched the vent on the car in the 22 years I have owned it. So when I got home with hot fuel and a screaming fuel pump I popped the gas cap and it had a lot of pressure in it, way more than i would have ever thought. So that has me thinking I need to address a vent situation. It has never seemed to have issues of pulling a vacuum on the tank but I was surprised to hear and feel the volume of pressure come out when I popped the cap. Thoughts?
Stock fuel tank, baffled sump welded in for EFI, OEM line plugged at sender, and fuel is returned in the spare tire area of the tank.(took out spare tire well)
68 Barracuda Formula S 340
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Re: 68 Barracuda, Fuel Tank Vent
[Re: Bad340fish]
#2271989
03/18/17 08:34 PM
03/18/17 08:34 PM
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Joined: May 2003
Posts: 96,661
On The Boat, On The Lake, Wa. ...
amxautox
Still Retired. Still Posting on Moparts. A Lot.
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Still Retired. Still Posting on Moparts. A Lot.
Joined: May 2003
Posts: 96,661
On The Boat, On The Lake, Wa. ...
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That small hose is the vent from the tank up to the filler. Sounds like you removed the hose, and plugged the nipple at the tank, and so it now has no vent. You might need a vented gas cap. Or redo the stock/original hose vent set up.
Tom
"Everyone should believe in something; I believe I'll go fishing."
-Henry David Thoreau
Men and fish are alike. They both get into trouble when they open their mouths
author unknown
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Re: 68 Barracuda, Fuel Tank Vent
[Re: Bad340fish]
#2272104
03/19/17 12:55 AM
03/19/17 12:55 AM
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Joined: Jan 2003
Posts: 8,022
Tulsa OK
Bad340fish
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I have never touched the hose coming off of the filler neck, there was never any additional vents on the tank. The only thing plugged is the original fuel line pickup that I no longer use because I added the sump. I guess I need to pull that hose off the filler neck and see if it is plugged.
68 Barracuda Formula S 340
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Re: 68 Barracuda, Fuel Tank Vent
[Re: Bad340fish]
#2272150
03/19/17 02:48 AM
03/19/17 02:48 AM
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Joined: Mar 2011
Posts: 1,653
Cut and Shoot, TX
kentj340
top fuel
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top fuel
Joined: Mar 2011
Posts: 1,653
Cut and Shoot, TX
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That vent line that starts near the top of the filler tube goes down through the same rubber gasket as the filler tube and terminates with an open end on top of the gas tank below the spare tire well. Usually black gum is deposited there.
If you don't see two dolphins, you need a vacation.
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Re: 68 Barracuda, Fuel Tank Vent
[Re: Bad340fish]
#2272184
03/19/17 09:13 AM
03/19/17 09:13 AM
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Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
Challenger 1
Too Many Posts
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Too Many Posts
Joined: Feb 2005
Posts: 28,312
Cincinnati, Ohio
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What all does the fuel tank vent consist of on a 68 barracuda fastback? I see a hose running off of the filler neck, does that just go into the frame rail somewhere?
The car is fuel injected and I have had some fuel heating issues. I have never touched the vent on the car in the 22 years I have owned it. So when I got home with hot fuel and a screaming fuel pump I popped the gas cap and it had a lot of pressure in it, way more than i would have ever thought. So that has me thinking I need to address a vent situation. It has never seemed to have issues of pulling a vacuum on the tank but I was surprised to hear and feel the volume of pressure come out when I popped the cap. Thoughts?
Stock fuel tank, baffled sump welded in for EFI, OEM line plugged at sender, and fuel is returned in the spare tire area of the tank.(took out spare tire well)
External Fuel pump? I betcha it is not plumbed properly that is why your fuel pump is cavatating. Put the fuel pump in the tank, is the best way. I am not betting on the vent being the problem. My 
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Re: 68 Barracuda, Fuel Tank Vent
[Re: kentj340]
#2272226
03/19/17 11:08 AM
03/19/17 11:08 AM
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Joined: Jan 2003
Posts: 8,022
Tulsa OK
Bad340fish
OP
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OP
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Posts: 8,022
Tulsa OK
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That vent line that starts near the top of the filler tube goes down through the same rubber gasket as the filler tube and terminates with an open end on top of the gas tank below the spare tire well. Usually black gum is deposited there. Thank you, it much be broken somewhere as I did not see it when I had the tank out. I will re run in, thanks for the information.
68 Barracuda Formula S 340
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Re: 68 Barracuda, Fuel Tank Vent
[Re: Bad340fish]
#2272715
03/20/17 01:09 AM
03/20/17 01:09 AM
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Joined: Jan 2003
Posts: 8,022
Tulsa OK
Bad340fish
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Tulsa OK
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They do thank you, it has been 20 years or so since I had that much interior out of it. Any more pictures of that car?
68 Barracuda Formula S 340
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Re: 68 Barracuda, Fuel Tank Vent
[Re: amxautox]
#2272731
03/20/17 02:01 AM
03/20/17 02:01 AM
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Joined: Jan 2003
Posts: 2,580
CT - just outside Hartford
Crazy73
master
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master
Joined: Jan 2003
Posts: 2,580
CT - just outside Hartford
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That small hose is the vent from the tank up to the filler. Sounds like you removed the hose, and plugged the nipple at the tank, and so it now has no vent. You might need a vented gas cap. Or redo the stock/original hose vent set up. Actually The '68 cuda does not have any nipples on the tank. The small hose vents from the top of the filler neck down into the left frame rail. Oddly enough just this past Friday morning I was thinking about how the tank in my car vented since I had replaced it with a new one in SS. I went and dug out the original tank and it did not have a nipple. Disaster averted!
Pete
-1968 Barracuda 4spd 383-6pk
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Re: 68 Barracuda, Fuel Tank Vent
[Re: Bad340fish]
#2272874
03/20/17 11:40 AM
03/20/17 11:40 AM
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Joined: Apr 2011
Posts: 315
Ontario, Canada
RealWing
enthusiast
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enthusiast
Joined: Apr 2011
Posts: 315
Ontario, Canada
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They do thank you, it has been 20 years or so since I had that much interior out of it. Any more pictures of that car? Lots and lots of pictures of the Cuda at http://www.forabodiesonly.com/mopar/threads/srt8cuda-build.218445/Or did you mean the Superbird? If you want some specific photos, just PM me. Jim
Last edited by RealWing; 03/20/17 11:43 AM.
1970 Superbird 440-6bbl, auto
1969 Barracuda 340-4bbl, FB Formula S auto
1969 Barracuda 6.1 L Hemi, 5 speed, Convertible
2022 Can Am Spyder RTL
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