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72 Dodge Evaporation Control #751907
August 26th 2019 8:21 am
August 26th 2019 8:21 am
Joined: Jul 2009
Posts: 5,332
Maryland
Lee7673 Offline OP
pooh-bah
Lee7673  Offline OP
pooh-bah
Joined: Jul 2009
Posts: 5,332
Maryland
Just picked up a 72 Dodge B200 and there are four hoses coming off of the gas tank going into a "tube' and from I can figure it it is part of the "evaporation control" system. Is this necessary/required? Can I bypass or disconnect it?


Re: 72 Dodge Evaporation Control [Re: Lee7673] #751911
August 26th 2019 9:40 am
August 26th 2019 9:40 am
Joined: Jan 2001
Posts: 2,403
East Brady, PA
M
Meanmachine Offline
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Meanmachine  Offline
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Joined: Jan 2001
Posts: 2,403
East Brady, PA
Are you referring to the black plastic canister underneath the passenger side of the van, about the size of a coffee can. That is the evap charcoal canister that recirculates gas vapors from the carb. My 76 has a hose coming from the tank into the canister and a hose from the carb connected to it.

Re: 72 Dodge Evaporation Control [Re: Lee7673] #751913
August 26th 2019 10:08 am
August 26th 2019 10:08 am
Joined: Aug 2001
Posts: 12,050
Fircrest, WA
Reed Offline
Maniac
Reed  Offline
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Joined: Aug 2001
Posts: 12,050
Fircrest, WA
The 1972 evaporative emission control was a one year only engineering miscarriage. The hose at each corner, in theory, allowed the gasoline fumes to be captured no matter what angle the van was parked at. In practice it was an overly complicated nuisance. These days parts are hard to find, so you are better served switching the system to a later style system with a single hose and a charcoal canister.


Windows- they're what make a van worth owning!
Re: 72 Dodge Evaporation Control [Re: Lee7673] #751915
August 26th 2019 12:42 pm
August 26th 2019 12:42 pm
Joined: Jul 2009
Posts: 5,332
Maryland
Lee7673 Offline OP
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Lee7673  Offline OP
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Maryland
There are 4 tubes coming from the fuel tank that go into a metal tube about 2” in diameter inside the body of the van behind the passenger rear wheel. Should I choose to replace tank and sending unit I am not sure I can even find a replacement


Re: 72 Dodge Evaporation Control [Re: Lee7673] #751916
August 26th 2019 12:47 pm
August 26th 2019 12:47 pm
Joined: Aug 2001
Posts: 12,050
Fircrest, WA
Reed Offline
Maniac
Reed  Offline
Maniac
Joined: Aug 2001
Posts: 12,050
Fircrest, WA
On the old B series van website there was a discussion about this system and how to convert it to a modern charcoal canister. I believe you can cap the fittings on the corners and go with a sending unit that uses a modern charcoal canister.


Windows- they're what make a van worth owning!
Re: 72 Dodge Evaporation Control [Re: Reed] #751917
August 26th 2019 12:55 pm
August 26th 2019 12:55 pm
Joined: Jul 2009
Posts: 5,332
Maryland
Lee7673 Offline OP
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Lee7673  Offline OP
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Joined: Jul 2009
Posts: 5,332
Maryland
Thanks. Let me check that out. I feel like I definitely want to convert


Re: 72 Dodge Evaporation Control [Re: Lee7673] #751920
August 26th 2019 2:04 pm
August 26th 2019 2:04 pm
Joined: Jan 2001
Posts: 2,403
East Brady, PA
M
Meanmachine Offline
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Meanmachine  Offline
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Joined: Jan 2001
Posts: 2,403
East Brady, PA
Lee, I just replaced the charcoal canister on my 76. I did some research on youtube and the mopar forums reading about repairs to the systems. There was a picture on one of them of the setup you have behind the spare tire. Some folks say to just eliminate them, others say to keep the evap system. Put a search in google or youtube for dodge charcoal canister or dodge or mopar evap system, lots of reading.

Re: 72 Dodge Evaporation Control [Re: Lee7673] #752130
September 03rd 2019 10:59 am
September 03rd 2019 10:59 am
Joined: Jul 2009
Posts: 5,332
Maryland
Lee7673 Offline OP
pooh-bah
Lee7673  Offline OP
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Joined: Jul 2009
Posts: 5,332
Maryland
This is the "tube" that was behind the paneling that the four tubes coming out of gas tank go into.

[Linked Image]gas tube by Lee Hatfield, on Flickr


Re: 72 Dodge Evaporation Control [Re: Lee7673] #752404
September 12th 2019 10:56 pm
September 12th 2019 10:56 pm
Joined: Mar 2007
Posts: 4,389
Dundee, Michigan
Ram4ever Offline

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Dundee, Michigan
Wow, thanks for posting that picture Lee, that's the first live one I've ever seen! I've got an ancient B100 shorty FSM which details it in a hose routing diagram, but I had no idea how huge it was in real life.

If it isn't causing identifiable problems I'd not prioritize converting it over other items which probably deserve far more immediate attention. The vehicle was designed for and did run with it after all. But, a more modern charcoal canister system would contain the fumes and free up that space in your cabin, and be more compatible with currently available fuel tanks.


-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: 72 Dodge Evaporation Control [Re: Ram4ever] #752410
September 13th 2019 1:49 pm
September 13th 2019 1:49 pm
Joined: Jul 2009
Posts: 5,332
Maryland
Lee7673 Offline OP
pooh-bah
Lee7673  Offline OP
pooh-bah
Joined: Jul 2009
Posts: 5,332
Maryland
Looking to swap out the motor (and fuel tank and lines) so will probably eliminate it. I don't recall a charcoal canister on my 77 though.


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