CRG Discussion Forum

Camaro Research Group Discussion => Maintenance => Topic started by: GaryL on December 24, 2005, 08:39:58 PM

Title: Original vented gas cap
Post by: GaryL on December 24, 2005, 08:39:58 PM
It has taken me a while to get my DZ to idle correctly. Yesterday I got some gas and the tank was pressurized. Is a vented gas cap supposed to hold any pressure? If it holds pressure could that affect how the car runs?
Title: Re: Original vented gas cap
Post by: JohnZ on December 25, 2005, 05:58:43 PM
Yes, the "vented" cap has a pressure/vacuum valve in it, and if the tank hasn't reached the threshold for the valve, it will "hiss" when you remove the cap to refuel.  :)
Title: Re: Original vented gas cap
Post by: william1 on October 05, 2009, 06:10:52 PM
http://www.camaros.org/forum/index.php?topic=239.0

 vented gas cap, johnz how much pressure are we talking about, i have looked and looked but can't put my finger on it, i think but not sure,, i'm having the same problem, as soon as i bleed off the tank it accelerates fine, the tank was replaced before i got the car so i have no idea if it might be a issue with that,, was just wonderin,,, have a new cap coming....
Title: Re: Original vented gas cap
Post by: JohnZ on October 05, 2009, 10:57:52 PM
Quote from: william1 on October 05, 2009, 06:10:52 PM
http://www.camaros.org/forum/index.php?topic=239.0

 vented gas cap, johnz how much pressure are we talking about, i have looked and looked but can't put my finger on it, i think but not sure,, i'm having the same problem, as soon as i bleed off the tank it accelerates fine, the tank was replaced before i got the car so i have no idea if it might be a issue with that,, was just wonderin,,, have a new cap coming....

I don't have the specs for the valve in the cap, but my original worked fine until it started leaking, and I replaced it with a reproduction about six years ago, and that works fine too.
Title: Re: Original vented gas cap
Post by: sixt9x33rs on October 09, 2009, 01:48:02 AM
My cap seems to hold a lot of pressure. When I take it off just seems to pop to hard. I dont recall having this issue with the original tank.

John Z would a tank change have anything to do with the pressure at the cap?

Thanks :)
Title: Re: Original vented gas cap
Post by: JohnZ on October 09, 2009, 03:49:36 PM
Quote from: sixt9x33rs on October 09, 2009, 01:48:02 AM
My cap seems to hold a lot of pressure. When I take it off just seems to pop to hard. I dont recall having this issue with the original tank.

John Z would a tank change have anything to do with the pressure at the cap?

Thanks :)

Nope, the tank change wouldn't affect it - but a cap change might.
Title: Re: Original vented gas cap
Post by: jdv69z on October 09, 2009, 07:12:52 PM
Quote from: JohnZ on December 25, 2005, 05:58:43 PM
Yes, the "vented" cap has a pressure/vacuum valve in it, and if the tank hasn't reached the threshold for the valve, it will "hiss" when you remove the cap to refuel.  :)

My cap's original, and works  just as John describes when I refuel

Jimmy V.
Title: Re: Original vented gas cap
Post by: sixt9x33rs on October 10, 2009, 02:15:15 AM
I have not changed the cap. I will check again to see if I have the same issue.