EFI conversion fuel lines

USatC · Dec 14, 2020

Hey guy,

i’m doing an EFI conversion on my 72 roadrunner and I was wondering what you guys were doing about fuel lines. A little concerned about running braided lines the length of the car so I wanted to see if that’s what guys who hard already done an EFI conversion we’re doing. Hardliners? Braided lines? What do ya think?

snakeoil24 · Dec 14, 2020

USatC said:
Hey guy,

i’m doing an EFI conversion on my 72 roadrunner and I was wondering what you guys were doing about fuel lines. A little concerned about running braided lines the length of the car so I wanted to see if that’s what guys who hard already done an EFI conversion we’re doing. Hardliners? Braided lines? What do ya think?

stainless 1/2 obth directions with short runs of braided insulate everything in engine compartment

USatC · Dec 14, 2020

snakeoil24 said:
stainless 1/2 obth directions with short runs of braided insulate everything in engine compartment

Are you running them along the same lines the stock ones go? Seems like a hard space to get them into

snakeoil24 · Dec 14, 2020

you will have to cut into sections and reflair with 47 degree flair

snakeoil24 · Dec 14, 2020

USatC said:
Are you running them along the same lines the stock ones go? Seems like a hard space to get them into

Major headache to run stainless their but necessary.

aeon280 · Dec 14, 2020

I ran braided 1/2 inch PTFE the whole length.

Crash520 · Dec 14, 2020

I ran -8 PFTE Braided tank to manifold and -6 PFTE Braided back to tank, that was several years ago now, no issues

JimKueneman · Dec 14, 2020

PTFE steel braided both ways. AN-6

gkent · Dec 14, 2020

I question what's safer, a single length of braided line or stainless hard lines with umpteen flare connections along the length !!!

snakeoil24 · Dec 14, 2020

allcare unsafe with gasoline. its a matter of degree of safety. with stainless id have it couled with stone guard and with braided id wrap it with kevlar fabric.

69L48Z27 · Dec 14, 2020

Use hardline. It does not need to be stainless and the companies that make fittings make hardline compression to AN fittings. Easy peasy. No flaring needed.

threewood · Dec 14, 2020

Use Nickle Copper 3/8" hardlines for both. Don't use stainless as it is a pain in the *** to flare. Follow the factory routing if you can.

Johnny Mac · Dec 15, 2020

threewood said:
Use Nickle Copper 3/8" hardlines for both. Don't use stainless as it is a pain in the *** to flare. Follow the factory routing if you can.

I Destroyed a flaring tool trying to flare stainless brake lines once. Swore Never again. lol
For what my opinion is worth, I usually run Steel braided on LONG runs where its 8+feet. Since i don't enjoy getting my fingers chewed up. I run the Nylon Black braided anywhere I can see it. Easier to work with, looks better (IMO)

My current hemi/clonerunner project is getting -10AN braided, Teflon lined. everywhere. But i'm chasing 4 digits in HP.

68Moparmaniac · Dec 15, 2020

Ran 3/8 SS tubing both ways with PTFE SS braided flex line for connections. A good Ridgid flaring tool works great. The flair is actually 37 degrees, had no problems. Held 92 psi overnight. All fittings are SS at McMaster Carr and with the sleeve set up you don't need to double flair the tubing

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matthon · Dec 15, 2020

JimKueneman said:
PTFE steel braided both ways. AN-6

Ditto, but I put the regulator on the frame rail near the tank, only 1 line up to the engine.
I also used Fragola fittings, easy peasy to put together, no special tools required, no baloney, takes a minute to put fitting on hose.

andyf · Dec 15, 2020

USatC said:
Hey guy,

i’m doing an EFI conversion on my 72 roadrunner and I was wondering what you guys were doing about fuel lines. A little concerned about running braided lines the length of the car so I wanted to see if that’s what guys who hard already done an EFI conversion we’re doing. Hardliners? Braided lines? What do ya think?

The easy way to do it is to buy a modern EFI gas tank with an internal pump and regulator. Then you just use the factory fuel line without the need for a return line. This gives you a factory look with very little hassle.

INTMD8 · Dec 15, 2020

^ You could run an external C5 corvette filter (has a built in regulator) back at the tank as well if you want to eliminate the return line.

I prefer it regulated at the engine however.

For my car I used -6, Goodridge 910 ptfe

andyf · Dec 15, 2020

USatC said:
Hey guy,

i’m doing an EFI conversion on my 72 roadrunner and I was wondering what you guys were doing about fuel lines. A little concerned about running braided lines the length of the car so I wanted to see if that’s what guys who hard already done an EFI conversion we’re doing. Hardliners? Braided lines? What do ya think?

Holley sells EFI modules that drop into the gas tank. The module has the pre filter, pump and regulator. That way you just use the existing factory fuel line and no return line is required. Not sure if they have a module that will fit your car. They have them for the first generation of RoadRunners. https://www.holley.com/products/fue..._pumps/efi_fuel_pumps/muscle_car_efi_modules/

snakeoil24 · Dec 15, 2020

i used 10 an fittings and braided short pieces thru 1/2 stainless, i have a flair tool for stainless its a bitch even with the right tool return line also 1/2 with aeromotive intank pump with the yellow foam baffel in tank

matthon · Dec 15, 2020

andyf said:
The easy way to do it is to buy a modern EFI gas tank with an internal pump and regulator

This is what I did, tanksinc and a Hyperfuel in tank pump with an fittings. Tank is well worth the $. No thank you on the tanksinc pump with npt fittings, all they offered at the time.

INTMD8 said:
You could run an external C5 corvette filter (has a built in regulator) back at the tank

I did this as well. The Hyperfuel pump has the option to use the internal regulator but I went with the Wix filter/regulator. External, filter included, needed an inline filter anyway.
Fyi, don't use efi rated rubber hose in the tank, it cannot be submerged, turns to jelly. Use the efi plastic hose in the tank, most pumps should come with it.

EFI conversion fuel lines

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