Venting a Duster fuel tank
#2831044
10/10/20 09:09 AM
10/10/20 09:09 AM
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Bob Stinson
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I've got a 71 Duster that I bought with the tank and filler tube out of the car because the trunk center was rotted out. Now that I've fixed the necessary, I ordered a new tank matching the one that came with the car - a single vent model. I went to install the tank and noticed there is nothing to connect the vent tube to. I looked in the parts book, and there is no vent tube for the car, just a single fuel line running front to back.
Can someone recommend the right way to vent this thing? I don't have the part in the trunk to use the 4-vent tank, and am not interested in correctness at all. I just need to be able to fill the tank and drive the car without an explosion hazard from venting fumes in the wrong way.
Thanks for any help with this.
69 road runner A12 ex-racer 71 Duster w/ a 400
Shiny paint causes stress.
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Re: Venting a Duster fuel tank
[Re: Sniper]
#2831077
10/10/20 11:05 AM
10/10/20 11:05 AM
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Joined: Jun 2019
Posts: 744 Almost Heaven
Bob Stinson
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I don't see any vents except for the California emissions type tank (vapor saver). That's not what I have. But it does make me think I should look at a 70 model book because I don't think the vapor saver package came around until 71.
69 road runner A12 ex-racer 71 Duster w/ a 400
Shiny paint causes stress.
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Re: Venting a Duster fuel tank
[Re: Bob Stinson]
#2831083
10/10/20 11:20 AM
10/10/20 11:20 AM
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Joined: Jun 2019
Posts: 744 Almost Heaven
Bob Stinson
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This looks like what I need - a different filler tube and a vent tube. I hadn't thought to just look at 1970, doh!
This still doesn't show the vent nipple, at the very top of the tank above the sending unit, but I would simply run a hose from the tank vent over the vent tube and be done.
Now to find the parts I need.
69 road runner A12 ex-racer 71 Duster w/ a 400
Shiny paint causes stress.
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Re: Venting a Duster fuel tank
[Re: Sniper]
#2831090
10/10/20 11:29 AM
10/10/20 11:29 AM
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Joined: Jun 2019
Posts: 744 Almost Heaven
Bob Stinson
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You say you have a 71 Duster. FSM says all 71's have it. The 70 FSM says only certain ones have it. So if it's a 70 without ECS then you don;t have it It's a 71 but it doesn't matter if I have the ECS or not at this point. I guess it had the right filler tube, but the wrong tank, and is missing the ECS tube. Then I turned around and bought a replacement tank of the same wrong type. That explains why I don't have a vent setup on the car. Now that I've found how the 70s are run, I know what I need to hunt down to make it work.
69 road runner A12 ex-racer 71 Duster w/ a 400
Shiny paint causes stress.
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Re: Venting a Duster fuel tank
[Re: AndyF]
#2831115
10/10/20 12:22 PM
10/10/20 12:22 PM
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Joined: May 2019
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Probably just need a vented gas cap for your make and model. Good luck with that. When I got my 51 the gas cap didn't vent, you could hear the tank oil canning as the sun heated it up. Bought a new one, did the same thing. Turns out the new caps have some sort of pressure valve to vent both pressure and vacuum. The original was essentially just a hole to atmosphere. Had to weaken the spring retaining the pressure to get it to stop oil canning the tank. Maybe an NOS one might work though. As for the vent nipple, I think that's an aftermarket thing since the tank in my 65 has the same vent setup as that 70 one the OP posted. No nipple above the sending unit.
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Re: Venting a Duster fuel tank
[Re: AndyF]
#2831126
10/10/20 12:38 PM
10/10/20 12:38 PM
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Joined: Jun 2019
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Bob Stinson
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Probably just need a vented gas cap for your make and model. I've read that if the tank itself isn't vented then it's hard to fill the thing up. Makes sense. If I can't find a 70 type filler tube, I'll just make my own vent tube from some 5/16" fuel line
69 road runner A12 ex-racer 71 Duster w/ a 400
Shiny paint causes stress.
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Re: Venting a Duster fuel tank
[Re: AndyF]
#2831788
10/12/20 07:33 AM
10/12/20 07:33 AM
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Bob Stinson
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Probably just need a vented gas cap for your make and model. FWIW after some study I gave up and ordered a vented cap based on your advice, and this note in Ehrenberg's auction: Great upgrade for pre-'73 A-bodies: Two-way check valve solves tank venting problems forever. All vent lines on tank can be capped off!
69 road runner A12 ex-racer 71 Duster w/ a 400
Shiny paint causes stress.
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Re: Venting a Duster fuel tank
[Re: Bob Stinson]
#2831797
10/12/20 07:59 AM
10/12/20 07:59 AM
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Joined: May 2019
Posts: 6,281 nowhere
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Probably just need a vented gas cap for your make and model. FWIW after some study I gave up and ordered a vented cap based on your advice, and this note in Ehrenberg's auction: Great upgrade for pre-'73 A-bodies: Two-way check valve solves tank venting problems forever. All vent lines on tank can be capped off! That is exactly the type of cap that made my gas tank oil can as it heated up and cooled off. I'd pass on it, not to mention tha tif you have any kind of emissions inspections capping off the vent lines would likely fail the visual.
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Re: Venting a Duster fuel tank
[Re: Sniper]
#2831957
10/12/20 02:58 PM
10/12/20 02:58 PM
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Joined: Jun 2019
Posts: 744 Almost Heaven
Bob Stinson
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Probably just need a vented gas cap for your make and model. FWIW after some study I gave up and ordered a vented cap based on your advice, and this note in Ehrenberg's auction: Great upgrade for pre-'73 A-bodies: Two-way check valve solves tank venting problems forever. All vent lines on tank can be capped off! That is exactly the type of cap that made my gas tank oil can as it heated up and cooled off. I'd pass on it, not to mention tha tif you have any kind of emissions inspections capping off the vent lines would likely fail the visual. There is no emission testing to worry about here in WV.
69 road runner A12 ex-racer 71 Duster w/ a 400
Shiny paint causes stress.
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Re: Venting a Duster fuel tank
[Re: Sniper]
#2831984
10/12/20 03:45 PM
10/12/20 03:45 PM
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Joined: Jan 2003
Posts: 20,624 Eagle, Idaho
Neil
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Yes, 1970 ECS was CA only, and in 1971 they all had it.
And the 70-71 ECS fill tubes and gas caps are unique as well. .
Last edited by Neil; 10/12/20 04:23 PM.
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