anyone else using a fuel return line?
Melting Slicks
Joined: Sep 1999
Posts: 2,712
Likes: 1
High volume fuel pumps feeding high HP engines usually require a return line to the fuel tank so the back pressure doesn't burn out the pump. I have a braided #10 line to a fuel log feeding the holley, then a braided #8 line returning to the top of the tank. If you look at my pictures, specifically the frame pic, you can see some of the plumbing if you look carefully.
Thread Starter
Race Director
Joined: Oct 2000
Posts: 15,036
Likes: 79
From: central FL, near the beach.
Originally Posted by vette rod
Return lines keep the fuel cool and minimize air bubbles.
2. bleeds off pressure, reduces hot soak flooding
Who knows how the 3 line fp works?(what is inside different than 2 line)
Racer
Joined: Feb 2005
Posts: 317
Likes: 2
From: coral gables miami
Originally Posted by Matt Gruber
thanks 67ratrag for the high hp answer.
.
Does anyone know when GM started using them, and why?
.
Does anyone know when GM started using them, and why?
Thread Starter
Race Director
Joined: Oct 2000
Posts: 15,036
Likes: 79
From: central FL, near the beach.
Originally Posted by gofastvette
Basically found on AC equiped cars. Nothing to do with fuel pressure as anything over 7 lbs will blow the carbs needle and seat anyway.
Who know how to rig a "defacto" return line(invisable to NCRS judges)? (to reduce this hot soak flooding)
Racer
Joined: Feb 2005
Posts: 317
Likes: 2
From: coral gables miami
Originally Posted by Matt Gruber
without a return line, on a hot soak, the fuel in the line between the fp and carb, can boil, flooding it.
Who know how to rig a "defacto" return line(invisable to NCRS judges)? (to reduce this hot soak flooding)
Who know how to rig a "defacto" return line(invisable to NCRS judges)? (to reduce this hot soak flooding)
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Safety Car
Joined: Nov 2004
Posts: 4,182
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From: going faster miles an hour...with the radio on in browns mills new jersey
Does anyone know when GM started using them, and why?
Drifting
Joined: Feb 1999
Posts: 1,808
Likes: 28
From: CA central coast
Nassau, are you sure it's a fuel return line... could it be a vapor line connecting the fuel tank to an emissions vapor charcoal canister?
The carb fuel bowl is also connected to the canister.
When the car is not running and heat causes vapors to be expelled from the carb and from the fuel tank, it flows through the canister, where the fuel in the vapor is absorbed by the charcoal; then when the engine is started, another hose causes suction that moves outside air through the canister, past the charcoal, vaporizing the absorbed fuel and pulling the vapor into the intake to be burned.
The carb fuel bowl is also connected to the canister.
When the car is not running and heat causes vapors to be expelled from the carb and from the fuel tank, it flows through the canister, where the fuel in the vapor is absorbed by the charcoal; then when the engine is started, another hose causes suction that moves outside air through the canister, past the charcoal, vaporizing the absorbed fuel and pulling the vapor into the intake to be burned.
