Full fuel line replacement! What would you do?

Tlee94sbc350 · Nov 10, 2019

Middle of a box of restoration and its time to choose what to run for fuel lines. So far I've got a brand new tank and fuel pump(advanced auto) and filter. Will eventually be a mild build and I'm open to suggestions. Anyone have thoughts on braided?

munrom77 · Nov 10, 2019

It’s a pain to do the ends but I went with nylon fuel lines

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Dubs · Nov 11, 2019

I did braided ss with an fittings.

Schurkey · Nov 12, 2019

1. I'd ask a moderator to combine my two threads on the same subject.
https://www.gmt400.com/threads/full-fuel-line-replacement-what-would-you-do.46683/

2. I'd use whatever GM used, pulled directly from a salvage-yard vehicle. Cheap and efficient. If I absolutely had to buy "new", I'd be forming double-wall seamless steel tubing because it's cheap, light, durable, and easy to work with. Combine with the shortest segments of hose I could get by with, to allow for engine shake and serviceability.

Using excess hose is crazy. Hose is expensive, and if it's rubber-based, it's porous, too. PTFE/Teflon liner hose is REALLY expensive, but at least it's somewhat durable and non-porous.

For the record, it's really unlikely that folks are using "AN" fittings, as that's an obsolete Military spec of supreme quality, the replacement spec is suitable for aerospace use. Most likely, you're using the non-aerospace grade of 37 degree flare fittings which used to be called "JIC" but are now covered by an SAE spec which I'm too lazy to look up.

Dubs · Nov 12, 2019

Schurkey said:
1. I'd ask a moderator to combine my two threads on the same subject.
https://www.gmt400.com/threads/full-fuel-line-replacement-what-would-you-do.46683/

2. I'd use whatever GM used, pulled directly from a salvage-yard vehicle. Cheap and efficient. If I absolutely had to buy "new", I'd be forming double-wall seamless steel tubing because it's cheap, light, durable, and easy to work with. Combine with the shortest segments of hose I could get by with, to allow for engine shake and serviceability.

Using excess hose is crazy. Hose is expensive, and if it's rubber-based, it's porous, too. PTFE/Teflon liner hose is REALLY expensive, but at least it's somewhat durable and non-porous.

For the record, it's really unlikely that folks are using "AN" fittings, as that's an obsolete Military spec of supreme quality, the replacement spec is suitable for aerospace use. Most likely, you're using the non-aerospace grade of 37 degree flare fittings which used to be called "JIC" but are now covered by an SAE spec which I'm too lazy to look up.

My apologies, I didnt realize you were an engineer. I didnt want to go nerd and get into details. Yes you are correct though. 37* non-aerospace but DOT approved.

Frankenchevy · Nov 13, 2019

I used NiCopp on my square. Really easy to bend and flare and ethanol resistant. Did 3/8” lines when I installed my Sniper/L31 setup.

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Tlee94sbc350 · Nov 14, 2019

Schurkey said:
1. I'd ask a moderator to combine my two threads on the same subject.
https://www.gmt400.com/threads/full-fuel-line-replacement-what-would-you-do.46683/

2. I'd use whatever GM used, pulled directly from a salvage-yard vehicle. Cheap and efficient. If I absolutely had to buy "new", I'd be forming double-wall seamless steel tubing because it's cheap, light, durable, and easy to work with. Combine with the shortest segments of hose I could get by with, to allow for engine shake and serviceability.

Using excess hose is crazy. Hose is expensive, and if it's rubber-based, it's porous, too. PTFE/Teflon liner hose is REALLY expensive, but at least it's somewhat durable and non-porous.

For the record, it's really unlikely that folks are using "AN" fittings, as that's an obsolete Military spec of supreme quality, the replacement spec is suitable for aerospace use. Most likely, you're using the non-aerospace grade of 37 degree flare fittings which used to be called "JIC" but are now covered by an SAE spec which I'm too lazy to look up.

Not too sure how to ask a moderator to delete the other thread. But nice write up! I'm prolly take your 2nd option. I was just curious if anyone had a different approach.

deadbeat · Nov 14, 2019

munrom77 said:
It’s a pain to do the ends but I went with nylon fuel lines

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When I did the nylon lines on my truck I put them in a brake line flare tool, went on super easy.

454cid · Nov 15, 2019

I thought JIC was industrial stuff?

Dubs · Nov 15, 2019

454cid said:
I thought JIC was industrial stuff?

It is. It's the commercialized version of AN. Tolerances aren't as tight. But they dont have to be for what we use them for. Plus we can pull over if something goes wrong. Cant exactly pull a plane over in mid flight.

Full fuel line replacement! What would you do?

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