Gas Tank Vent

67Dart273 said
Look at the diagram in the thread. I BELIEVE the vent which originally went up front is in the TOP of the vent tube, and the ones going to the tank are in the BOTTOM. This allows the vent to be "above fuel" and allows any slopover to drain back to the tank. So I believe it's important to tie into the original front line.

Sounds to me like you likely have a pressure / vacuum cap. It should be rather deep and clumsy, and appear to have a valve inside.

The 69's and earlier, and some 70 (no CA) all used sealed caps

http://www.forabodiesonly.com/mopar/showthread.php?t=183956

Pressure vacuum cap in this thread

http://www.forabodiesonly.com/mopar/showthread.php?t=202184

Thanks that diagram does help. Although there is no way to see inside that tube so its hard to tell which one was the vent line. I believe I know which one it is but with out the car being near me I have to remember to do this. Also thanks for the link explaining the cap to me.