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Craigorypeck
Craigorypeck Reader
7/10/18 2:47 p.m.

I have braided hose in the trunk coming from tank and they stink of gas. Really sh1t quality. I wanna ditch and go to nylon lines.  Is there a fitting that'll go from an6 to hard nylon hose? 

Its hard to find braided hose that's actually got good rubber inside.. 

Thanks 

maschinenbau
maschinenbau GRM+ Memberand Dork
7/10/18 4:48 p.m.

You can also do hard lines. They make aluminum and coated steel lines in 5/16 diameter which is plenty for most cars and adapters for AN fittings. It's cheap and durable, but can be a pain to bend and install.

Craigorypeck
Craigorypeck Reader
7/10/18 5:34 p.m.

In reply to maschinenbau :

Yeah after doing the entire brake system, bending solid tubing isnt any fun. 

I kinda need a bit of flexibility to get the line where i need it to go... 

 

Fitzauto
Fitzauto Dork
7/10/18 5:56 p.m.

Curious what brand hose you used as Ill be ordering some for my surge tank soon.

Craigorypeck
Craigorypeck Reader
7/10/18 7:13 p.m.

In reply to Fitzauto :

One from Amazon and the other locally.. Both pretty poor. It seems when you can't see the rating on the hose ie r9, r10 etc who knows what garbage they try and fob you off with..  Lines all stink.. 

Fitzauto
Fitzauto Dork
7/10/18 8:13 p.m.

Hm. Im going with earls for my project. Might look into that?

Datsun310Guy
Datsun310Guy UltimaDork
7/10/18 9:38 p.m.

I’ll look at my Parker hydraulic hose fuel compatibility chart tomorrow to see if they recommend a hose for gasoline.  

I sell the large CAT diesel guys a lot of hydraulic hoses for their diesel lines.  I would think these would be a hearty hose.  

221FR

Craigorypeck
Craigorypeck Reader
7/10/18 10:26 p.m.
Datsun310Guy said:

I’ll look at my Parker hydraulic hose fuel compatibility chart tomorrow to see if they recommend a hose for gasoline.  

I sell the large CAT diesel guys a lot of hydraulic hoses for their diesel lines.  I would think these would be a hearty hose.  

221FR

Does that push into an AN6 fitting the same as the braided stuff does? 

impulsive
impulsive Reader
7/12/18 8:33 p.m.

I use Russell ProClassic on one of my turds and can always smell vapor.

After doing some reading, it sounds like PTFE hose is the way to go.

https://www.pegasusautoracing.com/productselection.asp?Product=3490

http://www.radiumauto.com/PTFE-Hose-Assemblies-P267.aspx

 

 

 

 

Patrick
Patrick GRM+ Memberand MegaDork
7/12/18 8:40 p.m.

I used all braided stainless on the belair.  It smells like gas all the time, always has.  I used rigid aluminum on the datsun with rubber insulated clamps and only short sections of braided at the ends to give room for flexibility.  Much better in my opinion and it was easy to work with.  Tube nuts and sleeves and a flare tool and it installs to male an fittings.  Will do the same from now on.  

Knurled.
Knurled. GRM+ Memberand MegaDork
7/12/18 8:57 p.m.
Craigorypeck said:

I have braided hose in the trunk coming from tank and they stink of gas. Really sh1t quality. I wanna ditch and go to nylon lines.  Is there a fitting that'll go from an6 to hard nylon hose?

 

Sort-of.

 

The way I am doing it on a certain long-term project build is to put a 3/8" hardline quick disconnect fitting on the nylon line.  Then make a section of 3/8" hardline with a GM fuel line fitting on one end and a 37 degree flare on the other end, with an assist from an AN -6 tube nut and ferrule.

 

It helps that I have access to a Mastercool flaring kit, with the full AN 37 degree flare assortment, as well as a nylon line fitting installation kit (forgot who made it).

Datsun310Guy
Datsun310Guy UltimaDork
7/13/18 8:34 a.m.

The Parker hose needs a crimp fitting. 

The downside to Teflon is the hose can get bent and you kink the inner Teflon core that will leak.   

Parker recommends 221FR for gasoline.  

Datsun310Guy
Datsun310Guy UltimaDork
7/13/18 9:34 a.m.

Correction - Parker sells field attachable fittings that we all hate.  Series 20 or 22.  

A 1/2” female JIC swivel fitting is 3” long as compared to a 1/2” FJIC crimp fitting that is 1.75” long.  

Any one need assemblies?

44Dwarf
44Dwarf UberDork
7/13/18 10:18 a.m.

Your using the wrong hose.  You want a Teflon lined hose for fuel and or brake systems.  You'll never get a stick or weep with a properly made teflon lined hose.

Ranger50
Ranger50 UltimaDork
7/13/18 10:49 a.m.
44Dwarf said:

Your using the wrong hose.  You want a Teflon lined hose for fuel and or brake systems.  You'll never get a stick or weep with a properly made teflon lined hose.

I was just going to say this... You want a lined hose to avoid the fumes. On aircraft, who cares when your zipping along at 300mph. Lol.

Even then, I seen to recall seeing pictures of many rigid lines with just enough hose between to connect over bending points.

klodkrawler05
klodkrawler05 Reader
7/13/18 12:39 p.m.

I don't have any direct fuel system AN experience but the handful of times I've used AN fittings on an oil system they always weep no matter what I do, too tight, not tight enough it doesn't seem to matter. 

An acquaintance suggested this stuff from Pegasus as it has a higher heat rating than the usual AN stuff (which is perfect for oiling) After using it one time both myself and the friend helping me have sworn off using any other AN line type if we can help it. 

The Pegasus fittings actually thread into the hose itself and then the exterior collet clamps over the exterior and it seems near impossible to make one of these leak. After several events there is no sign of oil weepage anywhere.

I see it's rated for fuel also so should work for you. Be warned, it's not quite as budget friendly as the cheaper stuff. 

https://www.pegasusautoracing.com/group.asp?GroupID=PLUMANFLEX

 

one of the Pegasus straight fittings with any brand of your choosing's barb fitting should allow you to adapt from this stuff to the nylon hose you've got already.

 

kb58
kb58 SuperDork
7/13/18 5:49 p.m.

Agree with the comments about using the wrong hose. I've switched to Teflon where needed (such as fixing the turbo oil drain-back hose that got sucked flat by the dry sump pump, generating a glorious full-scale cumulous cloud in the dyno shop's parking lot, but I digress).

I've never used hard line but very much understand the attraction. My only concern about using aluminum hard line is the chance of it work-hardening and resulting in 60-psi fuel spraying everywhere. Maybe it doesn't happen, but I'm chicken to find out.

frenchyd
frenchyd SuperDork
7/13/18 6:08 p.m.
44Dwarf said:

Your using the wrong hose.  You want a Teflon lined hose for fuel and or brake systems.  You'll never get a stick or weep with a properly made teflon lined hose.

He’s right. I raced with Teflon hose for decades and never had an issue. 

frenchyd
frenchyd SuperDork
7/13/18 6:12 p.m.
kb58 said:

Agree with the comments about using the wrong hose. I've switched to Teflon where needed (such as fixing the turbo oil drain-back hose that got sucked flat by the dry sump pump, generating a glorious full-scale cumulous cloud in the dyno shop's parking lot, but I digress).

I've never used hard line but very much understand the attraction. My only concern about using aluminum hard line is the chance of it work-hardening and resulting in 60-psi fuel spraying everywhere. Maybe it doesn't happen, but I'm chicken to find out.

With fuel if I go hard line it’s steel. The steel line in my 1953 MGTD doesn’t leak. Yes it’s original so 65 years isn’t bad!  

Craigorypeck
Craigorypeck Reader
7/24/18 11:38 a.m.

Ordered ptfe and associated fittings. Thanks 

P3PPY
P3PPY GRM+ Memberand Dork
8/22/22 1:47 p.m.

Bringing this one back from the dead – am I seeing here that it's acceptable/safe to replace my rusted out hard line with a braided line or Teflon line for a street car?

TheTallOne17
TheTallOne17 Reader
8/22/22 2:20 p.m.

In reply to P3PPY :

Brakes/Hydralic Clutch: Braided over PTFE. Try to use as muchj hardlie as you can to avoid "Squishyness" in braking system

Fuel: Straight/easy runs are cheaper to run hardline, I bent most of mine by hand. Braided PTFE for mating sections together or full runs if you want to swing it. Price out building yourself,vs buying, and make sure you account all fittings in your cost. I used summit branded with no issues

GameboyRMH
GameboyRMH GRM+ Memberand MegaDork
8/22/22 2:29 p.m.
klodkrawler05 said:

I don't have any direct fuel system AN experience but the handful of times I've used AN fittings on an oil system they always weep no matter what I do, too tight, not tight enough it doesn't seem to matter. 

An acquaintance suggested this stuff from Pegasus as it has a higher heat rating than the usual AN stuff (which is perfect for oiling) After using it one time both myself and the friend helping me have sworn off using any other AN line type if we can help it. 

The Pegasus fittings actually thread into the hose itself and then the exterior collet clamps over the exterior and it seems near impossible to make one of these leak. After several events there is no sign of oil weepage anywhere.

I see it's rated for fuel also so should work for you. Be warned, it's not quite as budget friendly as the cheaper stuff. 

https://www.pegasusautoracing.com/group.asp?GroupID=PLUMANFLEX

 

one of the Pegasus straight fittings with any brand of your choosing's barb fitting should allow you to adapt from this stuff to the nylon hose you've got already.

 

Haven't had any weeping issues with Aeroquip Startlite + Aeroquip reusable AN fittings on my AE92's oil cooler, putting some of the same together now for my Toyobaru's oil cooler.

P3PPY
P3PPY GRM+ Memberand Dork
8/22/22 10:01 p.m.
TheTallOne17 said:

In reply to P3PPY :

Brakes/Hydralic Clutch: Braided over PTFE. Try to use as muchj hardlie as you can to avoid "Squishyness" in braking system

Fuel: Straight/easy runs are cheaper to run hardline, I bent most of mine by hand. Braided PTFE for mating sections together or full runs if you want to swing it. Price out building yourself,vs buying, and make sure you account all fittings in your cost. I used summit branded with no issues

Thanks, I'll go with hard lines then. I cannot for the life of me manage to double flare my lines so I'm buying sticks and unioning them together and pretty extensively bending them myself at a cost of $75. I was hoping to find that there were cheaper alternatives out there (short of learning the skill of DF) but I guess this will work fine enough for me. 

Berck
Berck Reader
8/23/22 6:34 a.m.

AN fittings are single flare, not double. My rally car with braided stainless lines through the cockpit has no visible leaks, but does smell like fuel. Interested in this, but probably not motivated to replace them just for the smell. 

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