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| | | 72 Dodge Evaporation Control | Joined: Jul 2009 Posts: 6,256 Likes: 164 Master Metal Sculptor | OP Master Metal Sculptor Joined: Jul 2009 Posts: 6,256 Likes: 164 | 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 | Joined: Jan 2001 Posts: 2,964 Likes: 63 veteran | veteran Joined: Jan 2001 Posts: 2,964 Likes: 63 | 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 | Joined: Aug 2001 Posts: 12,107 Likes: 37 Maniac | Maniac Joined: Aug 2001 Posts: 12,107 Likes: 37 | 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 | Joined: Jul 2009 Posts: 6,256 Likes: 164 Master Metal Sculptor | OP Master Metal Sculptor Joined: Jul 2009 Posts: 6,256 Likes: 164 | 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 | Joined: Aug 2001 Posts: 12,107 Likes: 37 Maniac | Maniac Joined: Aug 2001 Posts: 12,107 Likes: 37 | 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 | Joined: Jul 2009 Posts: 6,256 Likes: 164 Master Metal Sculptor | OP Master Metal Sculptor Joined: Jul 2009 Posts: 6,256 Likes: 164 | Thanks. Let me check that out. I feel like I definitely want to convert | | | Re: 72 Dodge Evaporation Control | Joined: Jan 2001 Posts: 2,964 Likes: 63 veteran | veteran Joined: Jan 2001 Posts: 2,964 Likes: 63 | 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 | Joined: Jul 2009 Posts: 6,256 Likes: 164 Master Metal Sculptor | OP Master Metal Sculptor Joined: Jul 2009 Posts: 6,256 Likes: 164 | This is the "tube" that was behind the paneling that the four tubes coming out of gas tank go into. gas tube by Lee Hatfield, on Flickr | | | Re: 72 Dodge Evaporation Control | Joined: Mar 2007 Posts: 4,463 Likes: 12 pooh-bah | pooh-bah Joined: Mar 2007 Posts: 4,463 Likes: 12 | 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 It's what you learn after you know it all, that counts... Are you living to work, or working to live? Learning from my own mistakes is good, learning from yours would be much better! | | |
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