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If you have a vented gas cap, I got a question?

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Old Mar 13, 2008 | 04:35 PM
  #1  
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From: colorado
Car: 1992 Trans/am convertible
Engine: 305 TPI
Transmission: 700r4
Axle/Gears: 2.73 drum WS6
If you have a vented gas cap, I got a question?

Hi,

I was looking for a vented gas cap at autoparts stores around my neigborhood, and believe it or not the ratio of idiots that work there is incredible.
I ask for a vented gas cap and pretty much every person that helped me gave me the replacement gas cap for my car. Even after I explain to them that they are different I am regarded with some weird looks.
Vented gas cap, if you got them do you have a part number or a size or anything that can help me get one.
I am not looking for the ones you twist to realease pressure. I am looking for the ones that automatically release pressure. They usually have certain pressure tolerances before they release.

Thanks guys.

Searched and searched and searched whole morning, no part numbers to find (or I might just be senile )
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Old Mar 13, 2008 | 06:28 PM
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
It was hanging next to the non-vented cap here at Checker.

It still twists on & off. It just doesn't go "whoosh" when you twist it off.
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Old Mar 13, 2008 | 10:17 PM
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From: colorado
Car: 1992 Trans/am convertible
Engine: 305 TPI
Transmission: 700r4
Axle/Gears: 2.73 drum WS6
Re: If you have a vented gas cap, I got a question?

LOL.
I did not mean the cap that unscrews from the filler neck. The cap that I have now can be unscrewed on its own without unscrewing it from the filler neck. All this does it reveals pressure without unscrewing the cap. However, this is not how the vented gas caps work. The vented gas caps don't unscrew on their own. I hope this makes sense. All they gave me was a cap that I can release pressure off myself without taking it out of the filler neck. however, once that cap twists on it still holds pressure.
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Old Mar 13, 2008 | 10:36 PM
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Car: Pontiacs, Jeeps
Re: If you have a vented gas cap, I got a question?

Originally Posted by xlwhellraiser
Hi,
I ask for a vented gas cap and pretty much every person that helped me gave me the replacement gas cap for my car.
The replacement for your car should be a vented one in '92. Vented caps have been factory equipment for like 30 years.

and no, your last post did'nt make any sense, atleast not to me. Not trying to be a **** but it really did'nt.

Last edited by TheRealBlkBird; Mar 13, 2008 at 10:40 PM.
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Old Mar 14, 2008 | 01:39 AM
  #5  
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From: colorado
Car: 1992 Trans/am convertible
Engine: 305 TPI
Transmission: 700r4
Axle/Gears: 2.73 drum WS6
Re: If you have a vented gas cap, I got a question?

Ok, I'll try this again.

The cap I was given basically lets you release pressure without unscrewing the cap from the filler neck. To release pressure you rotate the cap that rotates itself to a certain point where it stops, and than if you twist it, it will start unscrewing from the filler neck.

So basically the cap twits in its own base without unlocking. Its there as a safety thing to release pressure before you unscrew the cap so too much "hot" pressure doesnt shoot in your face or sumtin'...

Did that make sense?
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Old Mar 14, 2008 | 11:34 AM
  #6  
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From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Do you want a "vented" cap, that allows air into the tank while installed? Like all caps before the emissions days?

Or, do you want something like some radiator caps, that you can vent when you want to vent the tank? I've never seen anything like that for fuel caps.

You've got me thoroughly confused.
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Old Mar 14, 2008 | 02:30 PM
  #7  
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From: Moscow Mills, Missouri
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Re: If you have a vented gas cap, I got a question?

Originally Posted by five7kid
You've got me thoroughly confused.
Ditto.
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Old Mar 14, 2008 | 04:24 PM
  #8  
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From: colorado
Car: 1992 Trans/am convertible
Engine: 305 TPI
Transmission: 700r4
Axle/Gears: 2.73 drum WS6
Re: If you have a vented gas cap, I got a question?

I got another one today, and its called. "Safety Vent cap". It comes with a freaking button you press to vent the fumes out. I am not kidding, thats how my other one worked. I am just looking for your typical cap that you were describing. However, nobody at any parts store can understand what I am trying to do. So I keep coming home with "Safety Vent Cap's"

All they do is hold pressure like a normal cap until you manually release it, Just like the radiator cap. Its f'n ridiculouos. What does one have to do to just get a vented gas cap???
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Old Mar 14, 2008 | 05:01 PM
  #9  
xlwhellraiser's Avatar
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From: colorado
Car: 1992 Trans/am convertible
Engine: 305 TPI
Transmission: 700r4
Axle/Gears: 2.73 drum WS6
Re: If you have a vented gas cap, I got a question?

All I need is the cap that wont hold pressure in the tank, so yes the vented cap. Anyone know the part number at checker.

Went to another autozone and I got a CST cap, 5791, it said it was vented in their system but when I put it on drove home, sure enough the pressure came out when I unscrewed it.

I am getting very irritated at this point.

Last edited by xlwhellraiser; Mar 14, 2008 at 11:59 PM.
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Old Mar 28, 2008 | 12:54 PM
  #10  
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From: A.Z.
Car: 89 TTA
Re: If you have a vented gas cap, I got a question?

I understand what you want,Im looking for one too,did you find one yet?
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Old Mar 28, 2008 | 03:44 PM
  #11  
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From: eastern mass
Car: 87 firebird none soon
Engine: None
Transmission: none
Axle/Gears: 2.73 10 bolt
Re: If you have a vented gas cap, I got a question?

Just leave the gosh darn valve open and see what happens, it is that simple.
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