Could someone pls explain: return fuel line
Thread Starter
Pro
Joined: Nov 2004
Posts: 607
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From: North Alabama
Could someone pls explain: return fuel line
The previous owner put a glass fuel filter on my car and capped off the return line that would have otherwise run into the stock filter. What is the purpose of the return line coming off the filter going back to the tank? Is there some part of the system that is not working properly because that line is capped off?
Burning Brakes
Joined: Feb 2005
Posts: 1,235
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From: Mesa AZ
the return line is so the excess fuel can return to the tank and so the fuel is always circulating to prevent vapor lock. it isnt absolutely nessecary to have but it doesn't hurt either. if you do alot of city driving you might want to put it back in.
Team Owner
Joined: Jul 1999
Posts: 26,545
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From: Huntersville NC
Originally Posted by Shrike
BTW, where can you get a correct fuel pump that uses the return line?
except for the op a "correct" fuel pump would not have a fuel return line outlet. For 68 and 69, the fuel return line comes off the fuel filter. In 1970 the fuel pump has the extra outlet for the fuel return line.
Thread Starter
Pro
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From: North Alabama
Originally Posted by chris75stingray
the return line is so the excess fuel can return to the tank and so the fuel is always circulating to prevent vapor lock. it isnt absolutely nessecary to have but it doesn't hurt either. if you do alot of city driving you might want to put it back in.
Burning Brakes
Joined: Oct 1999
Posts: 1,047
Likes: 1
From: Arlington Texas
Originally Posted by PRNDL
except for the op a "correct" fuel pump would not have a fuel return line outlet. For 68 and 69, the fuel return line comes off the fuel filter. In 1970 the fuel pump has the extra outlet for the fuel return line.
I wonder which works better? The pump return line or the filter?
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Racer
Joined: Mar 2005
Posts: 445
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From: SAN DIEGO(SANTEE) CA.
Originally Posted by vettepilot68
Thanks. Vapor lock is exactly what I was wondering about...
never have had a vapor lock problem since I did this on either one,
Le Mans Master
Joined: Jan 2006
Posts: 8,319
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From: Wilmington DE, Drive it like you stole it, 68 327 4 speed coupe
Originally Posted by Shrike
No kidding! I learn something new everyday ('course, I usually forget a couple of old things at the same time)
I wonder which works better? The pump return line or the filter?
I wonder which works better? The pump return line or the filter?
Dont know which works better, but i will tell u this those filters are expensive. I have the 327 and replace my filters each season. and its like 25 bucks each time i do from Napa
Thread Starter
Pro
Joined: Nov 2004
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From: North Alabama
Originally Posted by sweethence
Dont know which works better, but i will tell u this those filters are expensive. I have the 327 and replace my filters each season. and its like 25 bucks each time i do from Napa
...but what isnt 
CF Veteran
Joined: Aug 2005
Posts: 1,428
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From: Northern CA
St. Jude Donor '10-'12, '25
Originally Posted by Highhat
Sorry for feeling so dumb, but after my regulator (from electric pump), to where to you run the return line? Cant run it into the top of the tanK.
Thanks
Thanks
Pro
Joined: Sep 2004
Posts: 500
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From: Philadelphia PA
Are you saying at the bottom tank from where my electric pump draws, or to somewhere at the top of the tank (I presume there is a nipple coupling?.
Originally Posted by Gr8Wht
Both supply and return, as well as the vapor line (drivers side) go back to the tank and connect to the plate assembly (sending unit). Why can't you?
Team Owner
Joined: Jul 1999
Posts: 26,545
Likes: 46
From: Huntersville NC
If your vette originally had a fuel return line then the gas tank has a place for it. This is a pic of a 68 gastank that has a provision for the fuel return line. Cars that did not have the fuel return line (tripower 427s for example) had a different gas tank without that little nipple that you see in the pic.
[If your vette did not have a return line originally then you won't have an easy access point on your gas tank.]
[If your vette did not have a return line originally then you won't have an easy access point on your gas tank.]
Last edited by PRNDL; Apr 4, 2006 at 11:22 PM.
Pro
Joined: Sep 2004
Posts: 500
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From: Philadelphia PA
Thanks. Right on point. That's what I was afraid of.
Originally Posted by PRNDL
If your vette originally had a fuel return line then the gas tank has a place for it. This is a pic of a 68 gastank that has a provision for the fuel return line. Cars that did not have the fuel return line (tripower 427s for example) had a different gas tank without that little nipple that you see in the pic.
[If your vette did not have a return line originally then you won't have an easy access point on your gas tank.]
[If your vette did not have a return line originally then you won't have an easy access point on your gas tank.]
