Does Anyone Know What This Is On My 71? - Chevelle Tech
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post #1 of 25 (permalink) Old Oct 19th, 17, 3:05 PM Thread Starter
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Does Anyone Know What This Is On My 71?

Been trying to figure out what this line is for on my 71. It is open behind the upper left control arm and it looks like it runs along the frame to the rear.
[IMG][/IMG]

Last edited by Baldfart; Oct 19th, 17 at 3:24 PM.
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post #2 of 25 (permalink) Old Oct 19th, 17, 3:13 PM
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Re: Does Anyone Know What This Is On My 71?

A photo would be helpful.

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post #3 of 25 (permalink) Old Oct 19th, 17, 3:15 PM
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Re: Does Anyone Know What This Is On My 71?

Probably the fuel return line, think they were only on AC cars, my 72 has one but it's plugged, think it's purpose was to stop vapor lock on the original carburator system.

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post #4 of 25 (permalink) Old Oct 19th, 17, 3:17 PM Thread Starter
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Re: Does Anyone Know What This Is On My 71?

Been trying to upload photo, no luck . I'll keep trying!
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post #5 of 25 (permalink) Old Oct 19th, 17, 3:26 PM
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Re: Does Anyone Know What This Is On My 71?

Here's mine it's next to the fuel line with a red cap on it
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post #6 of 25 (permalink) Old Oct 19th, 17, 3:27 PM Thread Starter
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Re: Does Anyone Know What This Is On My 71?

[IMG][/IMG]
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post #7 of 25 (permalink) Old Oct 19th, 17, 3:29 PM
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Re: Does Anyone Know What This Is On My 71?

Whoops you said the left, that's the vent line for the charcoal canister

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post #8 of 25 (permalink) Old Oct 19th, 17, 3:33 PM
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Re: Does Anyone Know What This Is On My 71?

Yeah you can't plug it but you probably don't want it venting gas fumes right next to the headers
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post #9 of 25 (permalink) Old Oct 19th, 17, 3:34 PM Thread Starter
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Re: Does Anyone Know What This Is On My 71?

I can plug this off can't I? Probably just run a line away from the headers then if it has to vent.
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post #10 of 25 (permalink) Old Oct 19th, 17, 3:40 PM
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Re: Does Anyone Know What This Is On My 71?

Quote:
Originally Posted by Baldfart View Post
I can plug this off can't I?
If you plug it you will have to make a new vent for your gas tank, like drill a hole in your gas cap. Most people just run a hose from it to the inner fender well so it vents outside the engine bay.

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post #11 of 25 (permalink) Old Oct 19th, 17, 3:42 PM Thread Starter
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Re: Does Anyone Know What This Is On My 71?

Quote:
Originally Posted by sampoerna415 View Post
If you plug it you will have to make a new vent for your gas tank, like drill a hole in your gas cap. Most people just run a hose from it to the inner fender well so it vents outside the engine bay.
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post #12 of 25 (permalink) Old Oct 19th, 17, 3:55 PM
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Re: Does Anyone Know What This Is On My 71?

I have the same line open on my 71 Elco.I just leave a piece of 3/8's fuel hose on there and let it sit as high as possible in the engine compartment so it vents.Eventually I'll replace the charcoal cannister behind the left side headlight,they don't take up much room and do not consume any power from the engine.

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post #13 of 25 (permalink) Old Oct 19th, 17, 5:11 PM
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Re: Does Anyone Know What This Is On My 71?

Unless it has the three vent lines going from the back of the gas tank to the canister that is behind the back seat and then a rubber line running from the canister to the line your showing in your picture don't worry about it. You can just cap it off. That line would have run to the charcoal canister.

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post #14 of 25 (permalink) Old Oct 19th, 17, 5:31 PM
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Re: Does Anyone Know What This Is On My 71?

Quote:
Originally Posted by HKalin View Post
Unless it has the three vent lines going from the back of the gas tank to the canister that is behind the back seat and then a rubber line running from the canister to the line your showing in your picture don't worry about it. You can just cap it off. That line would have run to the charcoal canister.
Dude you got to have a vent some where in the system, I've seen too many cars spilling gas on a hard take off because of no vent, don't plug that line with out adding a vent somewhere else and it's a good practice to put a rollover check on it for safety, if you flip the car you don't want fuel dumping out the vent line.

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post #15 of 25 (permalink) Old Oct 19th, 17, 6:43 PM
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Re: Does Anyone Know What This Is On My 71?

Quote:
Originally Posted by sampoerna415 View Post
Dude you got to have a vent some where in the system, I've seen too many cars spilling gas on a hard take off because of no vent, don't plug that line with out adding a vent somewhere else and it's a good practice to put a rollover check on it for safety, if you flip the car you don't want fuel dumping out the vent line.
No s_it. I didn't know you knew that line was still hooked up to everything else.
That line may not be hooked to anything it could have just been left there. I have a 71 Malibu that had the 3 vented lines off the back of the tank that were all plugged off with rubber lines with bolts in them. It still had the canister behind the rear seat but no lines ran into it or out of it. The metal line that ran up to the charcoal canister along with the canister itself were already removed too. I don't no if he had the tank vented by the cap. I knew I was going to put a new tank in so I bought a 70 tank that has no vent lines coming out of it and run a vented cap. This is what I did with the canister behind the back seat.


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