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Topic: Fuel Lines

in Forum: C3 Fuel, Emission Control, and Exhaust Systems


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Fuel Lines (1/5)
 4/19/23 12:45pm
yellowperilGold Member
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Palm Harbor, FL - USA

Vette(s):
1972 small block convertible resto-mod


Joined: 11/27/2022
Posts: 4

I am looking for a definitive answer to this question: is the smaller of the two lines that run from the fuel pump to the gas tank along the passenger side frame rails a return line or a vent line, or neither? Thanks!

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Re: Fuel Lines (2/5)
 4/19/23 3:19pm
F4GaryGold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.


Joined: 8/26/2006
Posts: 1439

My guess is return line.  The vent line goes from the top driver side of the tank down the driver side frame to the charcoal canister.



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Re: Fuel Lines (3/5)
 4/19/23 10:36pm
Adams' AppleLifetime Member
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Duncanville, TX - USA

Vette(s):
#1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas


Joined: 11/8/2003
Posts: 20157

Yup...smaller line is fuel return from the fuel pump, or filter, depending on the year. Not sure if the '72 still have the return line coming off the fuel filter or not. 



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Re: Fuel Lines (4/5)
 4/20/23 8:02am
yellowperilGold Member
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Palm Harbor, FL - USA

Vette(s):
1972 small block convertible resto-mod


Joined: 11/27/2022
Posts: 4

Thanks guys, I tend to agree with the RETURN line answer for most of the reasons stated about there being vent lines on the DRIVER side that connect to the cannister (which is no longer there in my car). Now I need a C3 physicist to explain how and why an engine that burns fuel needs a method to recirculate it! 

Re: Fuel Lines (5/5)
 4/20/23 12:52pm
F4GaryGold Member
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Grapevine, TX - USA

Vette(s):
1972 LT-1 convertible with factory air.


Joined: 8/26/2006
Posts: 1439

I guess just a pressure relief for the pump when the bowls are full.

The LT-1 did not have a return line.

Quadrajet vs Holley maybe?



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