Venting

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BRog

BRog

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I have an original 1971 Dart slant 6 vehicle which I which I swapped out for a 340 motor. When I swapped the motor, I removed the black canister under the hood which was part of the vent system.

So now I have a 1/4” vent line that runs from tank to engine compartment and I’m not sure what to do with it. Should this just be capped and venting will occur through cas cap?
 
No I don't think you can do that as your cap isn't vented. Maybe use a vented cap or a fuel neck out of a 70?
 
NO MOPAR CAPS were vented. (At least the cars we are talking about here)

The ones from 70 (CA) and onwards were "pressure vacuum" in other words a relief valve

Either leave the 1/4" tube "up high" for a vent, or re-create the 69/ earlier vent in the fill tube. From there, earlier, the caps were sealed

Go to MyMopar, download a 69 or earlier manual and a manual for your car. The setup is detailed either in the fuel section or "emissions"
 
Vent? I vent at the bar with a couple buddy's and a lot of beer!
 
Run that vent line back into the fuel filter. Wix 33054.

This is what I have on my Demon:

fuelfilterwix33054.jpg
 
On the early cars they just vented to atmoshere. I would just run it up high so it wont leak fuel and vent it to atmoshere, or you could use it for a return line.
 
I would put the charcoal canister back in and plumb it in properly...or park outside
 
So first off, your vent line is 5/16", not 1/4". Mopar didn't switch to 1/4" vent line until 1972.
Assuming you have a stock tank and fuel setup your best bet is to leave it vented to atmosphere. Put a small filter at the end to keep crap from getting into it. It's so far from the fuel tank that you won't have any insane vapor/gas smell issues. Don't worry about it.

I wouldn't rig it to be a fuel return line unless you had a '72+ setup.
 
kiss said:
So first off, your vent line is 5/16", not 1/4". Mopar didn't switch to 1/4" vent line until 1972.
Assuming you have a stock tank and fuel setup your best bet is to leave it vented to atmosphere. Put a small filter at the end to keep crap from getting into it. It's so far from the fuel tank that you won't have any insane vapor/gas smell issues. Don't worry about it.

I wouldn't rig it to be a fuel return line unless you had a '72+ setup.
Click to expand...

I installed a new tank that had an extra vent line coming out the top , I ran it back and up in the trunk/ up high, w/ a couple of coils in it, and back down thru the trunk floor. Works fine , no fumes, no spillage on a roll over/ upside down. ' WHICH I HOPE NEVER HAPPENS !"
 
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