Question abouy gas caps

[67300VERT]

I recently replaced my gas cap with a non-vented replacement. My car is a 67 Chrysler 300 'vert. I was wondering; should I be using a vented or non-vented gas cap??

BTW, I've got the original dealer paperwork and window sticker for my car. I was ordered in December 1966 and delivered in Jan 1967. I'm about to look up the exact date BUT my car is soon to be 50 years old!!

OK. the delivery date was 1/7/67!! My car is seriously OLD! I bought it from the original owner's estate in April of 2005. I was 14 years old when my car was new. My car was delivered to Falls Church Chrysler/Plymouth in Virginia and I was living in Manassas Virginia at the time and a freshman in HS. I've been thinking back on what sort of winter that was, wondering why someone would buy a new car in January unless they HAD to!

I remember there being more than a fair amount of snow that winter....I remember my mom driving our Dodge Coronet down the road with the snow at least a foot deep. The road was not plowed!! Of course back then there was not a lot of traffic in Northern Virginia...Now, I don't think anyone would Dream of doing that unless they had a pretty big 4x4 truck!

 

[bm02tj]

Rock auto lists non vented
and that sounds correct to what I remember

 

[67300VERT]

Thanks! I replaced the cap a few years ago, the gasket on the original was not sealing that well. I think gas was leaking out of the cap as I drove but its been so long ago now I can't remember!!

 

[oldbee]

Very, people knew how to drive back then; I was a senior in high school. The last pickup I bought the salesman asked if I knew what positraction was(?)

 

[WileE]

Does the car have a vent, or does it have an evaporative control system ?

 

[Ranger16]

I don't think they used EVAP systems in '67.
The tank needs to be vented, either via the cap or a vent tube running up into the trunk.

This one is like my '69 Road Runner. The vent tube (upper right arrow) comes up through the trunk and back down and out again. You can see the rubber grommets where it enters and leaves the trunk (2 arrows to the left of the vent tube arrow).

This one is listed as '66/'67 B Body, which might be more representative of yours.

Either one would require a non-vented cap.

 

[1967coronet]

67 Chrysler 300 ?? my tank on my 67 coronet is only vented back to the fill tube to aid in pumping fuel into it. mine has a vented cap to release tank pressure.
JMHO but I think a lot of the vapor lock complaints on older mopars are more of a lack of tank venting issue when the temps are up and the fuel expands.

Ranger, my 67 only has the fill vent or the left side of the tube vent.

 

[Fran Blacker]

if you don't have a vented gas cap won't it create a vacuum in the tank as you use fuel. You won't be able to suck gas out with no air to replace it. There another thread going about vapor lock. wonder if this is the problem?

 

[67 coronet]

use a vented cap.had a prob on my 67 and turned out to be non vented cap and really hot weather combo.i even had to go so far as open the vent even more than the cap came with.drive around in warm weather for a bit and open the cap.if there is a rush of air you need to change it for sure.not as problematic in cold weather.