restricted return line system?
Thread Starter
Melting Slicks
Joined: Jun 2005
Posts: 2,293
Likes: 6
From: North of the Bay California
restricted return line system?
Whad tha? Well in an effort to not hijack Mybad79's thread about aftermarket fuel pumps.......
Can someone please explain how to do this? Lars mentioned it is done at the inlet of the carb.
I'm using a pump with one inlet and one outlet. I would like to use this pump, as it's new and "shiney".
Can someone please explain how to do this? Lars mentioned it is done at the inlet of the carb.
I'm using a pump with one inlet and one outlet. I would like to use this pump, as it's new and "shiney".
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
You can tap a return line anywhere after the pump before it gets to the carb. The closer the better. Just make sure the return is a size down in tube diameter. This way the fuel goes where it's needed and the excess pressure is bled out and through the return line to the tank.
Tech Contributor
Joined: Aug 1999
Posts: 14,356
Likes: 6,328
From: At my Bar drinking and wrenching in Lafayette Colorado
Install a "T" as close to the carb inlet as practical. Using "AN" fittings makes the plumbing job a bit easier. Using a -6 AN Tee, install a reducer off one of the T legs to drop the size down to -4 (1/4"). Plug weld the reducer closed, and then drill a 1/16" diameter hole in the weld plug. This will allow a steady stream of fuel to return to the tank without lowering fuel pressure or adversely affecting flow delivery to the carb. Works great.
If you want to get a bit fancier, use a Mallory return style regulator and "T" it in just before the carb.
If you want to get a bit fancier, use a Mallory return style regulator and "T" it in just before the carb.
Burning Brakes
Joined: Jan 2006
Posts: 1,223
Likes: 174
From: Fort Wayne IN
Originally Posted by lars
Plug weld the reducer closed, and then drill a 1/16" diameter hole in the weld plug. This will allow a steady stream of fuel to return to the tank without lowering fuel pressure or adversely affecting flow delivery to the carb.
Drifting
Joined: Jan 2004
Posts: 1,991
Likes: 3
From: Piscataway NJ
Race Director
Joined: Nov 2002
Posts: 12,142
Likes: 54
From: Taylor Michigan
Most of the automoblies using a return line are air conditioned. Corvettes are no exception. Performance engines do not require them or regulators if it`s a mechanical pump as they normally max out just under 7 lbs. or less, just enought to keep the needle on it`s seat..
Le Mans Master
Joined: Dec 2006
Posts: 8,837
Likes: 1,027
Most of the automoblies using a return line are air conditioned. Corvettes are no exception. Performance engines do not require them or regulators if it`s a mechanical pump as they normally max out just under 7 lbs. or less, just enought to keep the needle on it`s seat..
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Instructor
Joined: Apr 2006
Posts: 212
Likes: 0
From: Woodland Park Colorado
My jeep has its return on the fuel filter that you car buy at any auto store if you dont want to tap the fuel line. I thought of using it on my vett if I get a fuel pump like the one you want to use. Just a thought there are a few options.
Best Regards
Best Regards
Racer
Joined: Feb 2005
Posts: 317
Likes: 2
From: coral gables miami
PS, no reason to add a return line if no vapor lock appears
Last edited by gofastvette; Mar 29, 2007 at 10:07 AM.
Race Director
Joined: Nov 2002
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From: Taylor Michigan