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Charcoal Vapor Canister
#750251 July 04th 2019 4:56 pm
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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
Meanmachine #750262 July 04th 2019 10:17 pm
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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
Meanmachine #750276 July 05th 2019 12:42 pm
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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 I checked the part numbers and it shows the new number is the superceded number.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
Meanmachine #750431 July 09th 2019 9:55 am
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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.


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Re: Charcoal Vapor Canister
Meanmachine #750579 July 13th 2019 1:08 pm
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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
Meanmachine #750587 July 13th 2019 6:50 pm
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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
Meanmachine #750593 July 13th 2019 9:01 pm
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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
Meanmachine #750594 July 13th 2019 10:54 pm
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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
Meanmachine #750595 July 13th 2019 11:00 pm
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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!
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