Charcoal canister replacement source

[DirtDonk]

No. The '76 and '77's that had the higher mounted plastic canister over on the passenger side firewall do not use the condensing tank behind the driver's seat.
Only the previous years that used the steel can down low on the frame rail had that.

And I guess that Greg and anyone else doing it successfully the way he describes are just lucky.
The way I understood it, you're never supposed to hook uncontrolled vacuum to a vapor canister. The only reason computer controlled vehicles do is because they have an actual control circuit (CANP, or canister purge) wired into the computer that can control when the valve opens and closes.
Uncontrolled manifold vacuum can literally pull liquid gas up into the canister.

Granted, it's hard pressed to do so with it mounted so high, but even still, I don't see anything wrong with doing it the way Ford did it in the first place. Just let the intake charge pull it gently out and into the air-cleaner housing.
If you've got a computer and harness that are compatible with a CANP valve, by all means. But on a carb'ed engine, just let the carb suck it in. Not the full manifold vacuum of the intake.

The way the stock '76 would have been connected is:

1. Small fitting to the tank(s)
2. Medium fitting to the carb float bowl vent.
3. One of the large fittings would have a mushroom cap to allow atmospheric pressure balance but keep the crap out.
4. Second large fitting has a hose run to the side of the stock air filter housing and gently pulls the vapors out of the canister and into the engine intake air charge.

Pretty simple.
I've got pictures of a stock '76 here somewhere if I can find them.

Paul

 

[Rox Crusher]

I routed my purge line into the air intake tube between the air filter and the MAF.

Works perfectly.

 

[admin]

I've got pictures of a stock '76 here somewhere if I can find them.

Paul, that would be great if you could find those pics.

Thanks!

 

[904Bronco]

Paul, that would be great if you could find those pics.

Thanks!

Let me help Paul out...

Small hose runs back to the fuel tank(s)
Large flex hose to air cleaner
Mushroom cap
Fitting with rubber cap would go over to the Carb fuel vent fitting. Mine was Federal emissions (49 states) and was capped off at both locations

 

[DirtDonk]

That Doug. Always helpin' a brother out.

I'd bet that a PO capped those off at some point. I'm thinking FED or CA, if the vent was there on the carb, it was supposed to be connected. I have a FED truck that has it, but it is a '79 too. So it's also possible that for the first year or so they didn't connect them.
I'm just thinking it's more likely a PO capped it.

I'm guessing you had it smogged as well though, so did you run into that specifically where they said that because it's a FED truck, it was ok to run without the bowl vent circuit?

Paul

 

[DirtDonk]

Glad you had those pics for reference Doug. I knew mine were on the old hard drive that crashed, but I usually keep them on the camera SD card as a backup. This time though, I only see the other hose routing pics from under the hood. None of the evap section.

Sorry 'bout that Jon.
But, if any of the other hose routing info is needed, let me know. I put together a chart for a local guy here trying to verify his routing. He's got the chart, but I have the pics.

Paul

 

[crutch]

Let me help Paul out...

Small hose runs back to the fuel tank(s)
Large flex hose to air cleaner
Mushroom cap
Fitting with rubber cap would go over to the Carb fuel vent fitting. Mine was Federal emissions (49 states) and was capped off at both locations

Looks like all the replacement canisters don't come with the mushroom cap, is there a source for these somewhere?

I'm going with the Holley Sniper EFI, does it support the purge solenoid operation or is there a recommended way to configure with an aftermarket EFI?

 

[904Bronco]

Looks like all the replacement canisters don't come with the mushroom cap, is there a source for these somewhere?

I'm going with the Holley Sniper EFI, does it support the purge solenoid operation or is there a recommended way to configure with an aftermarket EFI?

Mushroom caps can be found on similar vintage Fords at the wrecking yards...

 

[DirtDonk]

...I'm going with the Holley Sniper EFI, does it support the purge solenoid operation or is there a recommended way to configure with an aftermarket EFI?

I don't know for sure, but I doubt it. Best to ask them of course, but when in doubt (or if they say no for certain) just connect the outlet to the air cleaner housing or somewhere ahead of the throttle body so it does not get full vacuum.
My personal feeling on factory EFI swaps would be to let it breath into the air filter and it's housing (if equipped) rather than plumb it in behind the MAF. But in the case of the Sniper and all other aftermarket TBI setups that don't use a separate MAF, anywhere in the air cleaner would be the ticket.

If you just terminate the open tube outside the air filter, you will still get most of the effect while driving, but I'm guessing you'd get some fumes when not driving. So best to keep it encapsulated within the filter.
In the case of a cone style filter, a simple hole in the rubber/plastic base, a hose fitting and you're probably in business. In the case of the typical round air filter with metal base, there are hose fitting options from the manufacturers. Primarily used for the PCV return air, they're also there for EVAP stuff.

Paul

 

[sykanr0ng]

Looks like all the replacement canisters don't come with the mushroom cap, is there a source for these somewhere?

Here is one source:

https://www.npdlink.com/store/produ...or_storage_canister_original-165320-6136.html

the other source:

http://www.foxresto.com/1979-93-Mustang-5-0-Charcoal-Canister-Cap-p/4879006.htm

(they do free shipping)

 

[jckkys]

If you simply go to the Bronco parts for sale forum on this sight you'll see an actual '77 Bronco charcoal canister for 25 bucks that MikeD is selling here;http://classicbroncos.com/forums/showthread.php?t=278028

 

[muskrat]

need some help please on the routing from the canister. I see that the large flexible hose goes to the air cleaner. I also have a smaller diameter flexible hose that is come out of the charcoal canister but have no idea where that one goes.

I looked at the diagram in this post and only references the one larger hose to the air cleaner. Any ideas?

Thanks. So tired of coming home from weekend trips to a garage and first floor of house smelling of fuel.

Dave

 

[DirtDonk]

Yes, if yours is the low-mount style you have one hose going to the air filter housing and the other one simply goes straight up and is fastened to the firewall with an old-school plastic loop thingy that looks like a precursor to a zip-tie.
The top is protected from crushing and closing off by a plastic bezel with an open top.
Later models of the low mount got the "mushroom caps" that we see on them today. Still keeps the hose from crushing, but also keeps debris and water from gaining entry.

If you have yours mounted up high on the firewall, the first port with the hose still goes to the air cleaner, while the second large port just gets a "mushroom cap" on top. Slipped right over the fitting on the canister, rather than any hose added.

The secondary ones are always to remain open to ambient pressure/air as vents, but covered to keep debris and splashing water out.

Paul

 

[muskrat]

Thanks Paul!

Funny, my Bronco buds have no canister at all n no fumes.

Gonna get the hoses hooked up properly and hope it helps. If not, I’ll get the 91, 5.0 Mustang replacement.


Sent from my iPhone using Tapatalk

 

[DirtDonk]

Yeah, fumes seem to be a hit-or-miss proposition with Broncos. Lots of places for them to emanate from, but doesn't always happen.
Some with perfectly functioning evap systems can still have issues, but those are usually the result of leaks in hoses and/or components.

But if your charcoal canister has gas in it and an open port, you're going to have fumes no matter what. If it's liquid, they're now considered done and you need a new one. But in the old days they said to bake it for awhile. Not sure how that was accomplished without either starting a fire in the oven or a fire with anyone that uses that kitchen though! So "baking" in the sun was the preferred method.

Paul

 

[sprdv1]

Yeah, fumes seem to be a hit-or-miss proposition with Broncos.

sure nuf, Never had an issue here... of course top is never on

 

[sprdv1]

Thanks Paul!

Funny, my Bronco buds have no canister at all n no fumes.

Gonna get the hoses hooked up properly and hope it helps. If not, I’ll get the 91, 5.0 Mustang replacement.

k

sounds like a good plan..