Fuel line help 71 bronco

[Shortstop87]

Hello guys,

Need help finding the (2) correct fuel like that connects to the main fuel tank in the rear.

https://ibb.co/C8PrC3D

These fuel lines connect to a reservoir that shares the fuel with the aux.

Can’t find anywhere Any help appreciated

 

[DirtDonk]

Those are the vent lines for the evaporative emissions system (charcoal canister) on the '70 to '75 Broncos. I have personally never seen them reproduced, but it's possible they're out there somewhere.
Or maybe someone has a good used set you could buy.

What is wrong with yours? Did not see anything obvious at a quick glance.
You can always substitute standard fuel hose, or a combination of fuel hose and hand-bent metal lines in a pinch.

Some of us upgrade to the '76 and '77 style though, which eliminates that secondary "condensing tank" up behind the driver's seat and run the later model charcoal canister in a higher location than the original down on the frame, and run new lines directly from the two tanks to a "T" fitting and then the single line to the canister up front.

Paul

 

[Shortstop87]

Thank you for the response. Tremendous information you just provided.

 

[DirtDonk]

Great, hope it helped. Usually it helps you find new ways to spend even more money!

Good luck. Let us know what you end up doing with the lines.

Paul

 

[DirtDonk]

Here's a pic of what the newer style canister looks like:


And the debris caps that fit the larger ports:

We call them "mushroom caps" but they probably have an official name that I can't think of at the moment.

You can buy just the canister only, or the canister with different mounting brackets and so forth. But this is the basic type you want, with the 4 ports.
Your tank vents will connect to the smallest fitting on the canister, and at least one cap to one of the large ports. The other one may get a hose to the air cleaner, or might get another mushroom cap.
The caps do not seal the ports off. They merely keep debris out.

Depending on how you set yours up, the medium size fitting (which was originally for the carburetor bowl vents) could be capped off (sealed) or used as your primary venting into the engine. It's the one that is used with full vacuum when the engine control computer is in charge of the vent solenoid. But can also be utilized in some situations without vacuum and just plumbed to the air cleaner housing.

The canister should be mounted up high as possible, either on the firewall or like we did one time where it was stuffed up very cleanly into the passenger side wheel well.
Different ways of doing it, but specific to your use.

Paul

 

[Shortstop87]

So here is my original: https://ibb.co/hWKyFxd

Does upgrading provide performance value? Or is this kinda just emissions control.

Thanks again Paul

 

[gr8scott]

I left my fuel/vapor separator intact. When my fuel expands I can actually hear it gurgling into the separator. There are plastic tubes inside
that extend to the top that keep liquid fuel inside but allows fuel vapor into the charcoal canister. From there it gets drawn into the engine
and burned in the combustion chambers. Mine has two tubes, yours will have three.

 

[DirtDonk]

Does upgrading provide performance value? Or is this kinda just emissions control.

It's more of a safety issue. In the model year '77 all vehicles (I believe) were required to remove all fuel related items from the cabin, and recess or cover all fuel filler necks.
Which is why the early '77 pickups were the last to have an in-cab gas tank and why we have what is called the "77.5" trucks.
Same for the Bronco, even though that was not a fuel tank. But it was still connected to gas.

So no, not a "performance" upgrade for the engine. Just for the atmosphere (keeping control of the fumes in the tank and air filter) and the safety of occupants.
The plastic condensing tank (has another official name, but I can't remember it at the moment) behind the driver was prone to splitting at the seam and leaking fumes by the bucketfull especially right after filling up and topping off.
Some are still in perfect shape 50 years later, but many did not last that long. My own split at about 20 years of age, but I "fixed it temporarily" with some gooey sealer and kept using it.
But with the reconditioning that I hope to do someday, that one will get the new style too. It's just cleaner.
But I'm keeping the system intact because even though it's "smog crap" it's actually pretty good and does not rob horsepower.

Paul