Gas Vapor Canaster
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Elder User
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Gas Vapor Canaster
Ok I understand that the OEM gas caps were vented which allowed for gas vapor expansion when hot. Has anyone come up with a solution for when you relocate the tanks to either the bed like mine or underneath between the frame? The aftermarket tank in my bed has a vent tube that is not plugged and in the Texas heat the whole garage smells like gas. 
I was thinking maybe adding a vapor canister but not certain how they work.
I was thinking maybe adding a vapor canister but not certain how they work.
Fleet Owner
Joined: Dec 2009
Posts: 20,678
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From: NorCal
Evaporative canisters contain activated charcoal which absorbs gasoline fumes.
The canister is connected by a tube (typically hardlined and then a lightweight metal foil) to the air filter housing. When the engine is running, the vacuum created evacuates the fumes and combines it with the air intake charge for combustion in essence drying out the charcoal.
The cycle is repeated over and over again.
The canister is connected by a tube (typically hardlined and then a lightweight metal foil) to the air filter housing. When the engine is running, the vacuum created evacuates the fumes and combines it with the air intake charge for combustion in essence drying out the charcoal.
The cycle is repeated over and over again.
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Elder User
Joined: May 2017
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Evaporative canisters contain activated charcoal which absorbs gasoline fumes.
The canister is connected by a tube (typically hardlined and then a lightweight metal foil) to the air filter housing. When the engine is running, the vacuum created evacuates the fumes and combines it with the air intake charge for combustion in essence drying out the charcoal.
The cycle is repeated over and over again.
The canister is connected by a tube (typically hardlined and then a lightweight metal foil) to the air filter housing. When the engine is running, the vacuum created evacuates the fumes and combines it with the air intake charge for combustion in essence drying out the charcoal.
The cycle is repeated over and over again.
I am going to pick up a canister and run a line to the carb. Wonder if fuel line will suffice?
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 83
From: NorCal
On my 73, the evap canister is mounted under the passenger seat-side of the frame. Later Dentsides have it directly below the battery - inboard.
On my 73, the configuration would have been from the canister a 90° rubber elbow, about a 3/4-inch OD metal tube along the frame and stubbed upwards about six inches in front of the firewall. From there a 36-inch metal foil tube to a fitting on the dirty side of a stock air filter housing. The flexible tube is used to absorb or account for engine vibration.. and probably metal not to catch on fire.
I figure 1/2- or 3/4-inch EMT would work fine but first source the flex tube, then size the metal tube. NAPA used to sell the foil tube but I understand no longer does.
Posting Guru
Joined: Mar 2016
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From: Barre Mass
Who is Steve? I'm Alan aka "HIO Silver".
On my 73, the evap canister is mounted under the passenger seat-side of the frame. Later Dentsides have it directly below the battery - inboard.
On my 73, the configuration would have been from the canister a 90° rubber elbow, about a 3/4-inch OD metal tube along the frame and stubbed upwards about six inches in front of the firewall. From there a 36-inch metal foil tube to a fitting on the dirty side of a stock air filter housing. The flexible tube is used to absorb or account for engine vibration.. and probably metal not to catch on fire.
I figure 1/2- or 3/4-inch EMT would work fine but first source the flex tube, then size the metal tube. NAPA used to sell the foil tube but I understand no longer does.
On my 73, the evap canister is mounted under the passenger seat-side of the frame. Later Dentsides have it directly below the battery - inboard.
On my 73, the configuration would have been from the canister a 90° rubber elbow, about a 3/4-inch OD metal tube along the frame and stubbed upwards about six inches in front of the firewall. From there a 36-inch metal foil tube to a fitting on the dirty side of a stock air filter housing. The flexible tube is used to absorb or account for engine vibration.. and probably metal not to catch on fire.
I figure 1/2- or 3/4-inch EMT would work fine but first source the flex tube, then size the metal tube. NAPA used to sell the foil tube but I understand no longer does.
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Thank you Brian
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