fuel return line
Thread Starter
Melting Slicks
Joined: Sep 2007
Posts: 2,149
Likes: 284
From: cary Il
fuel return line
does anybody know the purpose of the fuel return line in a 69, 390 bb, and do you need one. the solid lifter bb and Lt-1s dont have them. I know they have different carbs, but any other reason than that.
Tech Contributor
Joined: Aug 1999
Posts: 14,380
Likes: 6,390
From: At my Bar drinking and wrenching in Lafayette Colorado
The fuel return line prevents vapor lock when running pump gas on a hot day. It is essential to reliable street operation if running a carbureted car with a mechanical pump on the engine in hot climates - we never build cars without a return line any more.
Lars
Lars
Tech Contributor
Joined: Aug 1999
Posts: 14,380
Likes: 6,390
From: At my Bar drinking and wrenching in Lafayette Colorado
You have an advantage down at low altitude with a little extra atmospheric pressure to prevent vapor lock. If you bring your car without a return line up here to 5,000 feet and try driving up into the mountains on a hot day (or even cruising in city traffic on a hot day), you'll be stranded alongside the road with all the other cars with out-of-State plates and no fuel return line...
Lars
Lars
Safety Car
Joined: May 2003
Posts: 3,814
Likes: 105
From: Dearborn Heights Michigan
You have an advantage down at low altitude with a little extra atmospheric pressure to prevent vapor lock. If you bring your car without a return line up here to 5,000 feet and try driving up into the mountains on a hot day (or even cruising in city traffic on a hot day), you'll be stranded alongside the road with all the other cars with out-of-State plates and no fuel return line...
Lars
Lars
Long as I have it this car will never leave the Detroit area, its Autocross home.
Your Holley carb advice has helped me in the past which I appreciate.
Last edited by FKING1; Jan 24, 2013 at 05:11 PM.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski