What are these plastic boxes?
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Elder User
Joined: Jul 2011
Posts: 793
Likes: 2
From: Vernon, BC
So when the tanks give off vapours they go to these boxes? At some point when the engine starts the fumes are drawn into the engine for combustion? Correct? Do they ever need replacing?
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Elder User
Joined: Jul 2011
Posts: 793
Likes: 2
From: Vernon, BC
I was hoping you wouldn't say that. Oh well, back to the drawing board. 
Thank you for the feedback and information.
Thank you for the feedback and information.
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Cargo Master
Joined: Mar 2007
Posts: 2,935
Likes: 34
From: Arcadia, Fla
By now those charcoal canisters are gummed up and not working like when new.
Unless you have emissions inspections, most times those canisters are removed and most never have any problems. But if you need them, I would reroute the offending one to another location. Its all vacuum hose that you can extend easy ,not like a high pressure oil line.
Unless you have emissions inspections, most times those canisters are removed and most never have any problems. But if you need them, I would reroute the offending one to another location. Its all vacuum hose that you can extend easy ,not like a high pressure oil line.
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Thread Starter
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Elder User
Joined: Jul 2011
Posts: 793
Likes: 2
From: Vernon, BC
By now those charcoal canisters are gummed up and not working like when new.
Unless you have emissions inspections, most times those canisters are removed and most never have any problems. But if you need them, I would reroute the offending one to another location. Its all vacuum hose that you can extend easy ,not like a high pressure oil line.
Unless you have emissions inspections, most times those canisters are removed and most never have any problems. But if you need them, I would reroute the offending one to another location. Its all vacuum hose that you can extend easy ,not like a high pressure oil line.
Cargo Master
Joined: Mar 2007
Posts: 2,935
Likes: 34
From: Arcadia, Fla
I think you may be right about them being gummed up. When I completely fill my rear tank I can smell gas until it drops down 1/4 tank or so. I am presuming the tank vents into those canisters and thereby the canister controls the gas vapours. I imagine the canister for the rear tank is gummed up/not functioning anymore. No odour from the front tank though. I will find a new place for one of the canisters as that location is ideal for the oil bypass unit I want to install.
Yep, if you smell gas fumes, then those canisters are bad. All tanks are vented to them and they should hold gas fumes till you start the engine. Once the engine is warmed up, the ECU will activate the canister purge valve to draw off the fumes.
On my trucks, the canisters have long be removed and I just vent the tanks twards the back of the truck.
Hotshot
Joined: Jun 2015
Posts: 12,830
Likes: 2,435
I think you may be right about them being gummed up. When I completely fill my rear tank I can smell gas until it drops down 1/4 tank or so. I am presuming the tank vents into those canisters and thereby the canister controls the gas vapours. I imagine the canister for the rear tank is gummed up/not functioning anymore. No odour from the front tank though. I will find a new place for one of the canisters as that location is ideal for the oil bypass unit I want to install.
Yep, if you smell gas fumes, then those canisters are bad. All tanks are vented to them and they should hold gas fumes till you start the engine. Once the engine is warmed up, the ECU will activate the canister purge valve to draw off the fumes.
On my trucks, the canisters have long be removed and I just vent the tanks twards the back of the truck.
On my trucks, the canisters have long be removed and I just vent the tanks twards the back of the truck.
Thread Starter
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Elder User
Joined: Jul 2011
Posts: 793
Likes: 2
From: Vernon, BC
There are two of them. You can just see the top one in the second photo. The bottom canister is linked to the top one via a hose. The top one has two hoses on it. One of course goes to the second canister and the other one goes somewhere to the rear of the engine compartment. Probably to the gas tank(s). I don't know if this would create my issue with smelling gas from the rear tank of my truck and not the front one. It's just a guess on my part.
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Mar 12, 2011 06:01 PM