Believe it or not, factory steel fuel lines can be lighter at 5/16 or 3/8 in size then some of the fancy braided steel lines out there.
Braided stainless steel impregnated with nylon lined rubber can add up in pounds as the footage covers the entire length of a car, especially on a long and wide B-body.
As low tech as this subject should be, here's some high tech pronounced words that simply narrow down to rubber.
Only after learning that nylon braided viton (Fluoroelastomer) hoses were more than 30 percent lighter than my stainless steel PTFE (polytetrafluoroethylene) nylon braided hoses did I break out the pencils and blueprints to refigure the system. The Viton hoses are the alternatives that are super lightweight in low key black and available from various companies such as Raceflux, Aeroquip, Earl's and others.
I personally liked the old and true Moroso natural finish hard aluminum fuel lines, but they don't come without their minuses.
I almost broke my thumbs and wrists making the tight bends and turns in order to follow most of the factory fuel line route with the stuff, especially when the line size was #8. The tight bends and twists didn't allow for one of my tube bending tools to get in there enough to do the job, so a lot was done with the slinky spring bending tools or by hand.
Bending by hand was tedious because I wanted perfect mandrill type bends, but it was achieved.
Aluminum lines are rumored to crack and rupture over time, but after 10 years of use, I beg to argue that point in that who ever came up with that assessment, must have not known what they were doing. Aluminum should not be applied where there is a good chance that it will vibrate. Secure it well and be done with it, but on the same token, keep an eye on it being that lots of parts are often eyed.
If it were up to me, I would have had a 3/8 factory steel line and called it a day, but the Aeromotive 1000 pump and filter out back and the fuel log upfront demanded for a #8 feed line and a #6 return line. Being that the return #6 line had a semi-different route and a few more complex bends compared to the feed line, Raceflux Viton got the nod for the return line.
The aluminum line and Viton return line were light to say the least. 3-1/2 Lbs and not counting all the aluminum AN fittings and second inline 100 micron filter.
The old braided steel lines with all aluminum fittings weighed 12-3/4 Lbs.
I was shocked to find that the stainless lines were more or less 9-1/4 Lbs heavier.
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