Substitute for the gas tank charcoal canister?

[joeyg1973]

My '71 didn't have the gas tank charcoal canister to filter out the fumes from the cabin. Has anybody come up with a better/cheaper alternative?

Does anybody have a diagram of how this is supposed to be hooked up?

 

[mattcamp]

I took mine out and all the return lines and just run a single gas line with a vented cap, works fine, no fumes.

 

[joeyg1973]

I took mine out and all the return lines and just run a single gas line with a vented cap, works fine, no fumes.

Unfortunately my state inspection would not be happy with that solution.

 

[John McVicker]

Unfortunately my state inspection would not be happy with that solution.

Your state still inspects '71's ??

John

 

[joeyg1973]

Your state still inspects '71's ??

John

I need more coffee. No, you are right, they do not, but I would rather go with a charcoal canister.

 

[Fast Eddy]

Get a used one from a later model. A '76 is pretty small. A '78 has an electric valve. You want it to vent into the air cleaner. Going through a BVSV in the thermostat housing that will only open when it gets hot is a great option.

 

[joeyg1973]

Get a used one from a later model. A '76 is pretty small. A '78 has an electric valve. You want it to vent into the air cleaner. Going through a BVSV in the thermostat housing that will only open when it gets hot is a great option.

No more BVSV... I have a custom fuel injection system, take a look at the build up thread in the tag line if you are interested.

What does the electric valve do on the '78?

Just to make sure I understand what the charcoal canister is doing... it is storing the fumes from the tank due to expansion when the motor isn't running. Once it starts up the vacuum from from the air cleaner cleans it out.

Why is there a need for charcoal in it if all it is doing is storing the fumes? Never really understood what this thing does except that it gets rid of the gas smell in the cab. Anybody care are to elaborate on how it works?

 

[vtcruiser60]

If you pay for shipping I have one on the shelf....small little bugger with the mounting bracket installed.

 

[Coolerman]

Why is there a need for charcoal in it if all it is doing is storing the fumes? Never really understood what this thing does except that it gets rid of the gas smell in the cab. Anybody care are to elaborate on how it works?

Activated carbon - Wikipedia, the free encyclopedia The key words: STORE the fumes

 

[Fast Eddy]

No more BVSV...

What does the electric valve do on the '78?

If you had one, you could put it back and use it for this. The bvsv would do the same thing as the electric valve; close it off when it's not running.

When the rig is not running you don't want fumes going in and out of the tank. You want it to vent into the charcoal can and get flushed out when you start the rig.

 

[joeyg1973]

Activated carbon - Wikipedia, the free encyclopedia The key words: STORE the fumes

It still doesn't make sense to me. Under Environmental Applications is does say:

Volatile organic compounds capture from painting, dry cleaning, gasoline dispensing operations, and other processes.
​

Under Fuel Storage it says that...

...gas may then be desorbed when subjected to higher temperatures...​

I don't think that the charcoal canister is being heated up... but then again I don't know how it is supposed to be hooked up so I don't know what all those hoses do. Without some heat being applied to the canister, the VOCs from the gasoline would simply attach to the charcoal in the canister till the charcoal was inert and would stop doing it's job because I don't see how a small vacuum from the air cleaner isn't going break the VOCs from the charcoal.

If anybody knows how this thing is hooked up and is willing to explain it, that would sure help a whole lot.

 

[Coolerman]

Though not Toyota specific this is how a cannister is hooked up in general...

 

[joeyg1973]

Thanks Coolerman!

Huh apparently with VOCs it doesn't need heat...

How Does a Carbon Canister Work? | eHow.com

Joe