Re: 69 coronet gas tank vents question
[Re: 7812845]
#1741977
01/31/15 12:19 PM
01/31/15 12:19 PM
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Joined: May 2007
Posts: 545
Massachusetts
LYNCHROAD69.5
mopar
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mopar
Joined: May 2007
Posts: 545
Massachusetts
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Quote:
Thanks so much for the links and info. It sounds like the second short line is really not necessary and since I'm not doing a total resto, it sounds like I could just cap off the second, short tube. What do you think? 
When I restored my car, the short vent line and clip were in perfect condition so a put them back as I found them. I'm hard pressed to think there is not an important reason for the second vent, but i'm unaware of its specific purpose.
Being an engineer, my guess would be redundancy...remember your tank has to breathe. In order to breathe, your tank must have a vent somewhere that will relieve both vacuum and pressure. Gasoline expands in volume as it warms up and shrinks in volume as it cools down. The fuel level of your tank changes throughout the day, even if you are not driving it.
Up through the 1960's, most vehicles used vented gas caps. This is simply a gas cap with a hole in it. Unfortunately, this hole would allow the fuel to splash out when accelerating or turning a corner. Your car (69 B Body) I believe did not come with a vented cap.
Also, with one vent line, If fuel becomes trapped in the line your tank will build pressure or vacuum until there is enough pressure to purge the vent which will cause gas and/or odor to come from the vent line. If enough pressure builds up damage could be caused to your tank...thus two vents...to answer your question, would i cap it...no...but I think you will have to decide what makes sense for your application.
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Re: 69 coronet gas tank vents question
[Re: 7812845]
#1741983
02/01/15 06:09 PM
02/01/15 06:09 PM
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Joined: Jul 2003
Posts: 329
N.Y.
VZCharger
enthusiast
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enthusiast
Joined: Jul 2003
Posts: 329
N.Y.
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I distinctly rememeber that when I bought and installed my vent lines on my 69 Coronet it came with both lines. Lots of vendors list it as a 2 piece set.
70 Charger blown injected BB
07 Charger Daytona Plum Crazy #389
69 Coronet ragtop
96 Ram "Garlits Edition"
88 Conquest TSi
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Re: 69 coronet gas tank vents question
[Re: 7812845]
#1741985
02/01/15 07:36 PM
02/01/15 07:36 PM
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Joined: Jul 2003
Posts: 329
N.Y.
VZCharger
enthusiast
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enthusiast
Joined: Jul 2003
Posts: 329
N.Y.
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http://www.manciniracing.com/futaveli2pc.html When I touched my lines they came apart despite looking OK. They are only $25 for the pair at Mancini.
70 Charger blown injected BB
07 Charger Daytona Plum Crazy #389
69 Coronet ragtop
96 Ram "Garlits Edition"
88 Conquest TSi
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Re: 69 coronet gas tank vents question
[Re: 7812845]
#1741986
02/01/15 07:55 PM
02/01/15 07:55 PM
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Joined: Apr 2010
Posts: 4,154
bethlehem pa
mikemee1331
master
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master
Joined: Apr 2010
Posts: 4,154
bethlehem pa
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Quote:
I just need the short vent tube. The long one is still on the car. If I can't find just the short one, I'll probably just make one from brake line tubing. 
tsk,tsk.... it is a well known rule of thumb when working on old mopars that you HAVE to spend ridiculous amounts of money on the simplest things. it's a must and a given! 
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