Ok, so my 71 Challenger has the 4 lines coming out of the side of the gas tank, and those 4 lines don't really go anywhere, there is no charcoal canister up front, etc...

So can I convert it to a 70 style non-ecs setup by just getting the 70 style tank and 70 style single vented line in the filler tube?

https://www.amazon.com/dp/B00S836492/ref...=I2IKPY3UVHA4R8

http://www.ebay.com/itm/1970-Challenger-...r-/252103959664

You could, but you would have gas fumes venting straight to the air and it would stink.
I'd get the 72-74 style tank and add a separator.

BTW, you can get that tank $100 cheaper at Rock Auto

Do you have one of these in your trunk? That silver pipe with a flange that screws to the trunk floor right behind the RR wheel.

I'd just buy the Tanks Inc. tank, if you haven't bought one already. My plan is to just have an open vent to atmosphere, it shouldn't stink all that much.

It will ...stink vented like that.
Aren't you worried about the ozone you would kill off with a open vent like that? joke No Green in your future I guess?! LOL !!

Never noticed the smell over the 7 years my 318 was vented that way.

Challenger1 has bad gas, so its an issue for him.

Here's a thread explaining it. Like Goody said, I don't think it matters and you should be able to switch over to a 70 style.

http://www.forabodiesonly.com/mopar/threads/weird-pipe-in-the-trunk.81458/#post-750582

You guys must not live where it's hot.
Every time I pull in the garage after a drive, 2 things happen, 1st I can hear the gas cap venting, then the stink of gas fills the garage.

Take your 5 gallon plastic gas can you use for the lawnmower, sit it out in the sun for a couple of hours, then bring in your house and open. Then tell me it doesn't stink

I've had two friends with Tanks Inc tanks, both leaked. Both returned them for Spectra.

And I have two friends who got Spectras before them, and they have had no problems.

I do have the tubes.



Ryan

You're right, I got it through Summit for the same cost as RockAuto.

In 2011, we hit >100ºF seventy times that Summer, it's plenty hot here. My Barracuda was in Las Vegas before I moved here, and it's plenty hot there too...

I have never had an issue with it.

The four corner vent system on a 71 and up fuel tanks are the best fuel tanks vents setups. Because combined with the vapor separator they allow the tank to vent at any angle the car is parked at even with a full fuel tank. That way no fumes and nothing coming out of the filler cap or anywhere else even in a over fill condition because it was closed system.
Some get confused because it is now a electric pump with a return line. "Maybe it don't need the same amount of venting as before"=false.

It still needs to be vented the same as before FI especially when it is parked.

Or they want you to vent through the electric pump, which is not nearly as good as 4 corner venting that your 71 already has.


It is really bad that they eliminated it in those fuel injected tanks, other wise that would be a slick fuel tank setup. I can see why you guys want to convince yourselves that stepping back into the 60s tank venting is OK.

It is funny to me how so many people don't understand the very simple and very good 4 corner closed venting setup and so want to go with 1960s venting and the rest of their cars are new tech.

That Don guy on the a bodies site is the only guy with a clue in that thread and most did not read what Don posted. Although he was wrong about E bodies, all of them after 71 had 4 vent nipples on the fuel tanks because that venting system was superior to the early vent setups, at least on E bodies.

That fuel separator in your trunk is a important component of your vent system in 71. It should be used with a 4 nipple tank and the actual vent line going to the front of the car and be connected to the engine crankcase via the valve cover breather (correct for a 71) if you don't want a more complicated/modern charcoal canister up front.

And you can get/buy the correct fitting/functioning fuel caps for 71s ECS fuel filler necks. My

Even if you don't use it now, buy the tank with the 4 vent nipples.
You can just cap them if not used.
Whole new tank if you decide you want it later.......

Thinking out loud, if it were me... if you did convert to a single line vent off the tank then I would still connect it to the vapor separator in your trunk to any of one of the 4 nipples. Then if there was a vent on the fuel pump then I would connect it to the vapor separator also. Plug the unused nipples. Then at least there are 2 ways for the tank to vent and still for sure connect the vapor separator to the valve cover breather up front. No reason to ditch the vapor separator in your trunk, use it either way.

Picture of 72-74 E body tank I cut open.



71 E body tank and separator. It is a sealed tube/manifold that is a place for fumes to turn to liquid and run back to the fuel tank at the same time allows the tank to vent when connected to the engine crankcase.

I do not mean to remove or get rid of the system, but it's missing big chunks and I was hoping I'd be simplifying it by going to the 70 style with the single vent tube.

There is a 4-vent setup. I just don't know if they actually have the lines in the tank.

https://www.amazon.com/dp/B00S8363RU/ref...=I1FVOV45YO4M8A

Yes that is the correct tank with the four vents!

What "chunks" are missing? You mean the VS is rusted up?

On my 2 '70 Challengers the only times I've noticed gas fumes is after I've topped the tanks when storing for winter. Then if we got some unseasonably warm fall weather the gas would expand and get to the overflow tube, which I find interesting that it is routed to vent into the rear frame rail! I remember one high 70s day in late October I smelled gas in my garage and found a pool of gas on my floor that was leaking from the frame rail.
I replaced my 71s tank with a new Spectra a few years ago, and its emission venting system in in place. I got concerned as I noticed gas fumes in my garage constantly afterwards and wasn't sure why. Then one day after stopping for gas before parking the car in the garage, I smelled bad fumes before I even exited the car After pulling into the garage. I looked under the rear and saw gas dripping from the filler neck grommet. Asking around, a friend told me I should have greased with white grease the filler grommet before installing the filler neck. Fortunately after 2 or 3 months the fume and leakage issue seemed to go away, I guess the grommet swelled a bit or something and started sealing fully. Passing along the hint to grease the tank grommet when installing to help prevent this issue.

I agree...Vaseline is good for that also.

Also sometimes poorly vented tanks can develop pressure under certain conditions and cause leaks at places like at the grommets I am thinking.

All 4 lines are just dangling from the 4 tubes coming out of the original tank. I have no canister up front, I don't see any lines going into the large vent tube.

It is a simple straight forward hose hookup to the VS. Your car is a 71 and never had the canister up front and don't need it to use the VS in the rear.

Clamp your hoses on the fuel tank first.