Vented or non vented fuel cap?
up through 69 and "some of" 70 all these used UNvented caps. The venting was via a vent tube welded into the filler neck, goes up against the top of the quarter, then down through the trunk floor and "dead ends" open ended inside the rear frame rail. Once again, that was earlier
Like so
In CA in part of 70, and all later, the evap vapor control junk came about, IE "the carbon can." This system CHANGED nearly every single year or two in some ways or other
"OldmanMopar" I believe showed the differences in caps. This is determined by your FILLER NECK. These are NOT vented. They are known as "pressure vacuum"
72blunblu it turns out............
http://www.forabodiesonly.com/mopar/showpost.php?p=1969928450&postcount=6
The venting in those with the "pressure vacuum" caps is done by means of the evap vapor control system.
up through 69 and "some of" 70 all these used UNvented caps. The venting was via a vent tube welded into the filler neck, goes up against the top of the quarter, then down through the trunk floor and "dead ends" open ended inside the rear frame rail. Once again, that was earlier
Like so
In CA in part of 70, and all later, the evap vapor control junk came about, IE "the carbon can." This system CHANGED nearly every single year or two in some ways or other
"OldmanMopar" I believe showed the differences in caps. This is determined by your FILLER NECK. These are NOT vented. They are known as "pressure vacuum"
72blunblu it turns out............
http://www.forabodiesonly.com/mopar/showpost.php?p=1969928450&postcount=6
The venting in those with the "pressure vacuum" caps is done by means of the evap vapor control system.