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Re: Gas tank venting problem - help!
[Re: aar1]
#444913
08/21/09 09:05 AM
08/21/09 09:05 AM
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Joined: Mar 2005
Posts: 707
Tecumseh, Ontario, Canada
Moparnut
super stock
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super stock
Joined: Mar 2005
Posts: 707
Tecumseh, Ontario, Canada
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I am assuming this is a new tank that was installed when the car was restored or tank replaced. You can add a vent but would have to drop the tank and empty to put in a vent. I would not do this in the car for fear of fire. I had a buddy do this and he dropped the tank and welded a nipple on the tank. (Chev  ) I have also seen some people drill a very small hole in the cap to allow the release of pressure. Not my way of fixing a problem but have seen it done. I don't know where you can have the tank cap checked but I think there was a device that the old mechanics used to check them similar to what they are doing now to check gas caps for emission testing.
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Re: Gas tank venting problem - help!
[Re: Moparnut]
#444914
08/21/09 09:24 AM
08/21/09 09:24 AM
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Joined: Jul 2005
Posts: 1,181
Lost in the ozone again
stubbs300
Vacation
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Vacation
Joined: Jul 2005
Posts: 1,181
Lost in the ozone again
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Quote:
If you can located a vented cap then this should correct your issue. This will allow the pressure to escape.
Not in my case it doesn't with a vented cap! I'm sure the 70 cuda has alot more vent lines than my a100 and I can't put more than a 1/3 of a tank of gas before it starts happening to me. I think alot of it has to do with this reformulated crap thaey call gas. In the meantime, The struggle continues!
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Re: Gas tank venting problem - help!
[Re: aar1]
#444915
08/21/09 09:35 AM
08/21/09 09:35 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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Quote:
I just discovered that my gas tank DOES NOT have any vents in it.
Are you sure? I'm not familer with reg 70 tanks, but I'm sure there are vent nipples on the tank when it was made, no matter what year it was built for.
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Re: Gas tank venting problem - help!
[Re: aar1]
#444917
08/21/09 09:56 AM
08/21/09 09:56 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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Quote:
Yes........ there are no vent nipples on the tank. It IS NOT an original tank. A previous owner bought it from Year One about 15 years ago.
 Does it fit right? I'd get a correct tank for your 70 cuda and hook everything up like it was when new. 
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Re: Gas tank venting problem - help!
[Re: Challenger 1]
#444918
08/21/09 10:03 AM
08/21/09 10:03 AM
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Joined: Feb 2004
Posts: 788
middle of the country
aar1
OP
super stock
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OP
super stock
Joined: Feb 2004
Posts: 788
middle of the country
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Quote:
Does it fit right? I'd get a correct tank for your 70 cuda and hook everything up like it was when new.
The fit was fine, just no provision for venting 
If I do end up getting a "correct" tank, where's the best place to get them? Do they all come from the same chinese boat or are there any tanks out there that are better quality?
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Re: Gas tank venting problem - help!
[Re: aar1]
#444919
08/21/09 10:12 AM
08/21/09 10:12 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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Quote:
[
If I do end up getting a "correct" tank, where's the best place to get them? Do they all come from the same chinese boat or are there any tanks out there that are better quality?
E bay is one of the better choices I think. You might want to remove your tank and take a good look, because I'm thinking no one would make a tank without venting provisions.
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Re: Gas tank venting problem - help!
[Re: Snoopy]
#444923
08/21/09 01:55 PM
08/21/09 01:55 PM
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Joined: Feb 2004
Posts: 788
middle of the country
aar1
OP
super stock
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OP
super stock
Joined: Feb 2004
Posts: 788
middle of the country
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Quote:
Did you look on the front of the tank for vent nipples?
Looked and felt up there but couldn't find anything  Also.... if there were a vent nipple somewhere on the tank but the rubber vent hose just didn't get hooked up, the tank would not build up positive pressure, would it? The pressure would be released via the nipple and I would be smelling gas fumes, correct?
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Re: Gas tank venting problem - help!
[Re: aarcuda]
#444927
08/21/09 09:29 PM
08/21/09 09:29 PM
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Joined: Apr 2003
Posts: 1,286
Ft. Lauderdale, FL
solarguy
pro stock
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pro stock
Joined: Apr 2003
Posts: 1,286
Ft. Lauderdale, FL
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Quote:
the cuda vent should be on the passenger side top edge. I believe there is a slanted flat middle section (vs a rounded 90 degree top edge). a small nipple with a tiny hole in it. no vent on the filler neck
and it's hiding behind the heat sheild. Goes up through the trunk and back through the rear frame rail.
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Re: Gas tank venting problem - help!
[Re: solarguy]
#444928
08/22/09 12:04 AM
08/22/09 12:04 AM
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Joined: Jan 2003
Posts: 27,421
Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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A vented cap will vent all the time. You must have the newer cap that only vents when so much pressure or vacum is built up. Get a cap for something like a 66 Coronet or something along that line and you will be fine. Thats what I did on my sons 72 Dart. Ron
Last edited by 383man; 08/22/09 12:05 AM.
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Re: Gas tank venting problem - help!
[Re: aar1]
#444929
08/22/09 12:15 AM
08/22/09 12:15 AM
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Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
Rick_Ehrenberg
top fuel
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top fuel
Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
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There are 3 basic type of gas caps:
"NOT VENTED" - As the name implies. Seals tight. Used on cars with another method of venting the tank.
"VENTED" - basically, open to the atmosphere - a pinhole, etc. I suppose this could somehow get clogged or plugged, but this is hard to fathom.
"PRESSURE-VACUUM" - This type has a small check valve built in, allows unrestricted flow of make-up air in; vents to the atmosphere at a predetermined pressure point.
I have found that this last type covers a multitude of sins (venting problems, raw fuel spillage, etc.)
Rick E.
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