MoparFins

Please login or register.

Login with username, password and session length
Advanced search  

News:

We changed servers, which is good, and lost all passwords, which is bad. See above.

Pages: [1]   Go Down

Author Topic: Vented Gas Cap  (Read 634 times)

Bob Schaefer

  • Full Member
  • ***
  • Karma: +0/-0
  • Posts: 143
    • View Profile
Vented Gas Cap
« on: June 14, 2010, 08:25:55 AM »

Ok, so I have been driving modern vehicles for far too long, and I had forgotten what happens when you remove a non-vented gas cap...
 
So, I was looking on Rock Auto, and they have gas caps for a 1969 Dodge Monaco, and a Polara... and some even say Emission Control, which may or may not mean vented... I don't know. They all, however, say Exc Wagon. Thing is.... That's what I have.
 
So does anyone know what sort of gas cap I can get that is vented, and will fit my '69 Monaco Wagon?
 
Alternatively, is there a reason not to get one?
 
Thanks,
 
Bob
Logged
1969 Dodge Monaco Wagon
383 4bbl, Dual Exhaust
Electronic Ingnition

Steve

  • Administrator
  • Hero Member
  • *****
  • Karma: +1/-0
  • Posts: 8653
    • View Profile
Vented Gas Cap
« Reply #1 on: June 14, 2010, 08:51:42 AM »

They were none vented caps back then.  If they were vented, the left a trail of gas on the regular body.
 
Stant has several different options available.  But the way the system is made, you don't want a vented.  Vented would make sense to me too, but it doesn't work
Logged
Favorite Expression. . . Damned Kids.  Lots of projects.  Donations accepted

Bob Schaefer

  • Full Member
  • ***
  • Karma: +0/-0
  • Posts: 143
    • View Profile
Vented Gas Cap
« Reply #2 on: June 14, 2010, 09:26:03 AM »

That's kinda what I thought... I will go with the big HISS when I remove the cap, and let it work the way it's supposed to...
Thanks again,
 
Bob
Logged
1969 Dodge Monaco Wagon
383 4bbl, Dual Exhaust
Electronic Ingnition

Guests

  • Guest
Vented Gas Cap
« Reply #3 on: June 14, 2010, 09:05:02 PM »

Basically before the charcoal canisters and sealed systems, return systems, etc., they simply ran a 1/16th ID steel line from the filler neck, up into the C pillar or somewhere as high as possible, then back down and into the frame rail. It is then near impossible to have fuel come out of the pipe during a rollover, and when they clog/rust up, it takes time to figure out how to fix the problem once discovered.
Logged

Steve

  • Administrator
  • Hero Member
  • *****
  • Karma: +1/-0
  • Posts: 8653
    • View Profile
Vented Gas Cap
« Reply #4 on: June 16, 2010, 10:21:03 AM »

True. . .But they never released all the pressure, even when new.  Not sure how the wagans are vented. . . I'll look in a manual when i get a chance.
Logged
Favorite Expression. . . Damned Kids.  Lots of projects.  Donations accepted

Marc

  • Full Member
  • ***
  • Karma: +0/-0
  • Posts: 133
    • View Profile
Vented Gas Cap
« Reply #5 on: June 16, 2010, 10:29:13 AM »

Funny story we got a newer car in that the owner just couldnt figure out what was wrong. Had lost his gas cap and driven with it open for a while, but finaly decided to put an old cap he had lying around on the car. then it wouldnt run right and it would die he changed fuel filter and pump but still couldnt get it to go. turns out it was a non vented cap so my brother got a good running car cheap.
Logged
All Kinds of Mopar Parts

sunriee

  • Newbie
  • *
  • Karma: +0/-0
  • Posts: 6
    • View Profile
Vented Gas Cap
« Reply #6 on: January 28, 2011, 06:58:50 AM »

The vented gas cap is designed to vent small amounts of air into the car gas tank line. The vented gas cap has a one-way release valve that is pressure-activated. When the pressure reaches a certain point (defined by so many pounds per square inch) the valve opens by a very small amount, relieving some of the pressure. In this case, the pressure is formed on the outside of the tank, due to the vacuum formed from the displacement of fuel on the inside.
_______________

   www.sinosells.com


Logged
Pages: [1]   Go Up
 

© 2008-2014 Steve Hobby • © 2015 Allpar, LLC