Topic: fuel lines
in Forum: C3 Fuel, Emission Control, and Exhaust Systems
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Former Member
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Lisle, IL - USA
Joined: 6/18/2002
Posts: 125
Vette(s): 1973 coupe Under Construction
I have been shopping for lines and cleaning up the tank and noticed there are three fuel lines. I know one goes to the front fender for the charcol canister, and another is obviously a supply off of the sender. What is the third for?
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Former Member
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Lisle, IL - USA
Joined: 6/18/2002
Posts: 125
Vette(s): 1973 coupe Under Construction
I always though that you only needed a return line for fuel injection, at least thats what ive heard and experienced with aircraft engines
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Duncanville, TX - USA
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Nope. Look at your fuel pump. There will be the metal line going to the carb., one rubber hose from the tank(3/8"), and a smaller one as a return(5/16"). 
Joel Adams
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The return line is there to keep the fuel circulating back from the front of the car to the rear. Not for performance etc, but to help cool the fuel and prevent vapor lock. Fuel moving slowly in the lined can heat up from the exhaust and engine heat, and boil. The return line can also return any vapor to the tank instead of going to the carb.
Former Member
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Lisle, IL - USA
Joined: 6/18/2002
Posts: 125
Vette(s): 1973 coupe Under Construction
Thanks for all of the info, I can always find a good description here.
in Forum: C3 Fuel, Emission Control, and Exhaust Systems
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