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Charcoal Vapor Canister #750251
July 04th 2019 4:56 pm
July 04th 2019 4:56 pm
Joined: Jan 2001
Posts: 2,242
East Brady, PA
M
Meanmachine Offline OP
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Meanmachine  Offline OP
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East Brady, PA
Have the original on my 76 Dodge, how important are these canisters. A few guys have told me they unhooked them and plugged the hose on their 70s Mopar muscle cars. I get a gas fume smell at times and have read that the charcoal in the canister is full. A couple times when I have filled the van completely full with gas, the gas has dripped out the canister. I read where the charcoal can actually break down into small pieces and get sucked up into the carburetor.

Re: Charcoal Vapor Canister [Re: Meanmachine] #750262
July 04th 2019 10:17 pm
July 04th 2019 10:17 pm
Joined: Aug 2001
Posts: 12,034
Fircrest, WA
Reed Offline
Maniac
Reed  Offline
Maniac
Joined: Aug 2001
Posts: 12,034
Fircrest, WA
The purpose of the charcoal cannister is to absorb and store fuel vapors that evaporate out of the float bowl on the carb. There is really no benefit or point to disconnecting it. It is actually very beneficial. There is a filter on the botom that can be changed or you can replace the old one with a new unit.

It sounds like yours has degraded and you need a new one. They can be hard to find, but I know they are out there.


Windows- they're what make a van worth owning!
Re: Charcoal Vapor Canister [Re: Meanmachine] #750276
July 05th 2019 12:42 pm
July 05th 2019 12:42 pm
Joined: Jan 2001
Posts: 2,242
East Brady, PA
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Meanmachine Offline OP
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Meanmachine  Offline OP
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East Brady, PA
I have a new canister in the box, it looks different than the original one in size or dimensions, my old one has a drain tube on the side where the filter is, the new one doesn't have a drain. I checked the part numbers and it shows the new number is the superceded number. Have to find some time and drop the old one from underneath and compare them.

Re: Charcoal Vapor Canister [Re: Meanmachine] #750431
July 09th 2019 9:55 am
July 09th 2019 9:55 am
Joined: Mar 2007
Posts: 4,365
Dundee, Michigan
Ram4ever Offline

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Ram4ever  Offline

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Dundee, Michigan
You'll want to take a vacuum pump and verify the plumbing of that canister. Some of the substitute canisters aren't direct replacements, but require work, such as drilling out plugs or identifying the correct port amongst several. The filter is often non existent, with later canisters having gone to a sealed system.


-It's been such a LONG TIME... BlueShift>> 1981 Dodge Ram B250 Custom Sportsman Maxi Van


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It's what you learn after you know it all, that counts...

Are you living to work, or working to live?

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Re: Charcoal Vapor Canister [Re: Meanmachine] #750579
July 13th 2019 1:08 pm
July 13th 2019 1:08 pm
Joined: Jan 2001
Posts: 2,242
East Brady, PA
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Meanmachine Offline OP
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Meanmachine  Offline OP
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East Brady, PA
I unhooked the old canister today and had got a new filter for it. When I took the side off to change the filter, charcoal started pouring out. I have the new canister that supercedes the old part number but the ports are different locations than the old one, so not sure which hose goes where.

Re: Charcoal Vapor Canister [Re: Meanmachine] #750587
July 13th 2019 6:50 pm
July 13th 2019 6:50 pm
Joined: Aug 2001
Posts: 12,034
Fircrest, WA
Reed Offline
Maniac
Reed  Offline
Maniac
Joined: Aug 2001
Posts: 12,034
Fircrest, WA
Hook them up by function. The ports on the canister should be labelled- carb, tank vent, some such.

Where did you find a new canister? I need a couple for my vehicles.


Windows- they're what make a van worth owning!
Re: Charcoal Vapor Canister [Re: Meanmachine] #750593
July 13th 2019 9:01 pm
July 13th 2019 9:01 pm
Joined: Jan 2001
Posts: 2,242
East Brady, PA
M
Meanmachine Offline OP
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Meanmachine  Offline OP
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East Brady, PA
Reed, I bought it through the Dodge dealership back in 2002 and it has been setting in a box in my Mid-Dodge spare parts since. The old canister is stamped carb, vent, etc, the new one isn't. For replacement canisters, punch in the part numbers in an internet search, quite a few out there, but some are very expensive.

Re: Charcoal Vapor Canister [Re: Meanmachine] #750594
July 13th 2019 10:54 pm
July 13th 2019 10:54 pm
Joined: Feb 2018
Posts: 33
California
oldpar Offline
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oldpar  Offline
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Posts: 33
California
Ditto meanmachine !

In the california models late 1970s some have 2 cannisters. The filter element on the bottom breaks down and charcoal runs out. I got one from Turners wrecking in Fresno Ca. (lots of older dodge vans). The one he sent me did not fit, bought NOS from Brads NOS (you can find him with a quick search).
I do not remember what I did with the non fit. will look around and see if I saved it.

Last edited by oldpar; July 13th 2019 10:58 pm.

1979 Dodge B200 wrangler factory authorized van conversion.
360 cid 727 auto trans NP203 full time 4 wd
Re: Charcoal Vapor Canister [Re: Meanmachine] #750595
July 13th 2019 11:00 pm
July 13th 2019 11:00 pm
Joined: Aug 2001
Posts: 12,034
Fircrest, WA
Reed Offline
Maniac
Reed  Offline
Maniac
Joined: Aug 2001
Posts: 12,034
Fircrest, WA
Originally Posted by Meanmachine
Reed, I bought it through the Dodge dealership back in 2002 and it has been setting in a box in my Mid-Dodge spare parts since. The old canister is stamped carb, vent, etc, the new one isn't. For replacement canisters, punch in the part numbers in an internet search, quite a few out there, but some are very expensive.


Thanks. I might do that.


Windows- they're what make a van worth owning!
Re: Charcoal Vapor Canister [Re: Meanmachine] #750614
July 14th 2019 12:03 pm
July 14th 2019 12:03 pm
Joined: Mar 2007
Posts: 4,365
Dundee, Michigan
Ram4ever Offline

pooh-bah
Ram4ever  Offline

pooh-bah
Joined: Mar 2007
Posts: 4,365
Dundee, Michigan
If it's the master cylinder of a pair, it will have the vacuum actuated valve on it.

Some of the canisters I referenced earlier may have several hose connectors, but one may be plugged internally, requiring you to drill it out. I think that in our case, actuating the vacuum valve and seeing if you can blow through a pair of tubes is enough to identify the hoses necessary to get the system running.

If you look carefully you may find that the hoses aren't really the same size ends. Dodge made a really perverse hose for in their canister system, which was a different size at one end than the other. I had to make up a reducer when I replaced the rotted ancient hoses.

I've heard of several people cutting failed canisters open and replacing deteriorated carbon with aquarium filter carbon, and improvising the plastic bags which rotted away. As long as the bag material can withstand gasoline fumes, it could work. The carbon just acts as a sump for vapors. I'd probably try Aluminum or Brass screen in place of the polymer screens used in the originals. Epoxy does bind to the canister plastic.


-It's been such a LONG TIME... BlueShift>> 1981 Dodge Ram B250 Custom Sportsman Maxi Van


[Linked Image]

It's what you learn after you know it all, that counts...

Are you living to work, or working to live?

[Linked Image]

Learning from my own mistakes is good, learning from yours would be much better! [Linked Image]
Re: Charcoal Vapor Canister [Re: Meanmachine] #750704
July 17th 2019 1:44 pm
July 17th 2019 1:44 pm
Joined: Jan 2001
Posts: 2,242
East Brady, PA
M
Meanmachine Offline OP
veteran
Meanmachine  Offline OP
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M
Joined: Jan 2001
Posts: 2,242
East Brady, PA
I was looking at the old canister today, has 3 ports, stamped Purge - Fuel Tank - Carb Bowl. What I find confusing is the Carb Bowl port is capped or plugged, wouldn't that be the one that would vent the carb. The hose from my Carb Bowl is attached to the Purge port. Like I mentioned before, I know very little about carbs or evap systems. Also on the old canister the Purge Port is 1/4" and on the new one it is 5/16", I guess I will have to use a some kind of fitting to make the hose fit the bigger port.

Last edited by Meanmachine; July 17th 2019 1:46 pm. Reason: sp
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