Charcoal Canister Upgrade Question

[NJBronk]

I've read a lot of threads on this, but I haven't found the exact answer I'm looking for:

I have a 1974 with the evaporator condenser behind the driver's seat and original charcoal can that is currently not connected to the air cleaner (is connected to vent lines).

I want to upgrade the canister to the newer version - can I simply put a vertical rollover valve (like this: https://www.summitracing.com/parts/tnk-vvr-il) where the existing canister is located, connected to the existing vent line, and then connect a new hose from there up to the new canister on the firewall? That would be leaving everything else in place for now, then I will decide after if I want to get rid of the condenser.

Is there any reason this won't work? Seems like the simplest way to just swap out the canister for the newer version.

Thanks.

 

[904Bronco]

I am not an expert...
Rollover valves are usually on the top of the tank, it doesn't make much sense to me to add another one at the former location of the round CC.
As far as replacing your round CC with a newer version mounted higher, I see no reason why it wouldn't work as long as you keep all the hose lines hooked up.
(Vent line from the tank(s), Carb bowl vent if equipped, flex line to factory air filter canister, and a mushroom vent cap)
Now if you remove the vapor recovery set up from behind the seat, well then you would need some sort of rollover valve to prevent gas from getting to the engine compartment. I can't offer further comment as I have always used aftermarket tanks that have the option, I have never tried to retrofit a stock tank(s).

 

[Steve83]

904 is right; a rollover valve does not replace a charcoal canister. If you want to replace the charcoal canister with a newer design, do that. But to work, it must be connected to the engine for purging. To add a modern(er) rollover valve, you'd have to cut a hole in the top of the tank for it. Study this page:

(click this text)


The PREVious few pages show the CANP.

 

[NJBronk]

Sorry, maybe my question wasn't clear. I plan to add the newer style canister on the firewall. So when removing the old can I figured why not use the rollover valve as the connection point?

I thought people put the rollover valve in-line (not in the tank)?

 

[Glass Pony]

You could put an in-line roll over check valve there and install the firewall charcoal canister but I believe the 1974 didn't have a roll over valve because that tank behind/side of driver's seat would catch the overflow. I would install it higher than the top of the gas tank though.
Since I have a 2" body lift I put it on top of the frame, under the body.

 

[NJBronk]

You could put an in-line roll over check valve there and install the firewall charcoal canister but I believe the 1974 didn't have a roll over valve because that tank behind/side of driver's seat would catch the overflow. I would install it higher than the top of the gas tank though.
Since I have a 2" body lift I put it on top of the frame, under the body.
View attachment 901942

That's why I was thinking the style I linked, which mounts vertically - I could mount it in the fender well where the canister was. I want to do the rollover valve because I'm sure I'll remove the condensing tank eventually.

 

[DirtDonk]

Ford put it ('76 and '77 models only) on the side of the passenger frame rail, just ahead of the crossmember where the tubing crossed over from the gas tank(s). So a couple of inches lower, and a few inches further forward than Glass Pony's. And on the passenger side.
Never pulled one apart unfortunately, but it was there in plain sight and half covered by a protective rock shield.

Paul