PTFE vs Rubber line fittings - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BR3W CITY · 04-03-2013, 05:06 PM

Help me out here guys, I've never even touched PTFE in a project before.

I decided to re-do some parts of my fuel system that had regular Fuel injection rubber line, since the NHRA rule doesn't seem to like that stuff

The rest of my system is mostly -6 AN braided stainless rubber-core line, and was assembled like I'm used to. But on ordering some new -8 AN stuff for part of the feed, I somehow ordered (or was sent) -8 PTFE. To make it more confusing, the two -8 fittings I ordered are from 2 manufacturers and look completely different.

Fitting #1 they sent me, -8 straight swivel AN fitting with the connection type I'm used to (small threads all the way up).

Fitting #2 from Aeroquip; -8 90* swivel, but with an end that has a ferrule on it.

Here is the hose

I'm guessing I can't use all this stuff together. Should I return the ptfe hose and find the regular rubber core to use fitting style #1 like I'm used to...or should I return fitting #1 and find a straight -8 that matches the style of fitting #2?

Marv D · 04-03-2013, 09:52 PM

I would returmn the ptfe stuff. It's for ultra high pressure (brake lines and P.S. hose ) I run a 58psi Magnafuel system on the LS buggy with regular ol an-6 with no hint of leaks or weeping For whatever thats worth. Just an opinion

Super73 · 04-04-2013, 02:33 AM

To add to what Marv is saying, not only have I run 58psi for years through standard -6 -8 -10 but I am now running E85 through new -6 -8 -10 and -12 summit brand braided stainless. I have left it in the cell for 3 months, no weeping and no leakage.
Posted via Mobile Device
Posted via Mobile Device

BR3W CITY · 04-05-2013, 12:09 PM

Alright well I got some rubber lined -8 and a regular AN 90* on the way, the PTFE is in the return pile. Now if only it would stay above 45* outside I could drive the thing.

LostMy65 · 01-02-2016, 09:59 PM

What did you end up going with?

BR3W CITY · 01-03-2016, 01:44 AM

Quote:

Originally Posted by LostMy65

What did you end up going with?

Quote:

Originally Posted by BR3W CITY

Alright well I got some rubber lined -8 and a regular AN 90* on the way, the PTFE is in the return pile.

^

Super73 · 01-04-2016, 07:06 PM

It is interesting that this post was brought to the top. I popped a fuel line earlier this year, -8 high pressure summit brand braided stainless. It looked at though it may had rubbed the bottle bracket so I did not think much of it.

This weekend however, same -8 (just a bit shorter now) popped again at an event pulling it off the trailer. There were no signs of running and all the braided was in perfect shape.

According to summit it was E85 friendly (non PTFE) when I bought it. I am at a point where I think I need to redo all the lines on the truck. Question is, PTFE or mostly hard line?

BR3W CITY · 01-05-2016, 01:17 AM

Hard line as much as possible IMO. Every hose system can be adapted to and from hard tube, and anything from Kerosene to pure Methanol wont hurt it.

hotrod 80 · 01-07-2016, 11:08 AM

Some of the older rubber lined hose will "melt" after a while . The newer stuff seems alcohol resistant . I have all newer stuff and have had no problems . I am also E85 . I don't see how you get the fuel uphill in the last picture.

Super73 · 01-07-2016, 03:03 PM

Hotrod,

I redid mine less than 3 years ago. Summit promised it was the new synthetic hose that was e85 acceptable.

Rannos · 01-07-2016, 04:12 PM

I ran 1/2" aluminum tubing. Just have to check your connections every now and then because of vibration. Was easy to bend and install.

04-04-2013, 02:33 AM	#3
Super73 Registered User Join Date: Nov 2007 Location: Bay Area, Ca Posts: 2,841	Re: PTFE vs Rubber line fittings To add to what Marv is saying, not only have I run 58psi for years through standard -6 -8 -10 but I am now running E85 through new -6 -8 -10 and -12 summit brand braided stainless. I have left it in the cell for 3 months, no weeping and no leakage. Posted via Mobile Device Posted via Mobile Device __________________ ------Motor---------------Bottle 60'---1.53---------------1.41 1/8---6.58 @ 105.92----5.87 @ 118.41 1/4---10.38 @ 126.97----9.24 @ 142.49

04-05-2013, 12:09 PM	#4
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: PTFE vs Rubber line fittings Alright well I got some rubber lined -8 and a regular AN 90* on the way, the PTFE is in the return pile. Now if only it would stay above 45* outside I could drive the thing. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

01-02-2016, 09:59 PM	#5
LostMy65 But Found Her 25yrs Later! Join Date: Oct 2010 Location: Oregon City, Oregon Posts: 10,528	Re: PTFE vs Rubber line fittings What did you end up going with? __________________ I lost my 65 - Found it 25 years later: http://67-72chevytrucks.com/vboard/s...d.php?t=426650 66 C20 Service Truck: http://67-72chevytrucks.com/vboard/s...d.php?t=428035

01-04-2016, 07:06 PM	#7
Super73 Registered User Join Date: Nov 2007 Location: Bay Area, Ca Posts: 2,841	Re: PTFE vs Rubber line fittings It is interesting that this post was brought to the top. I popped a fuel line earlier this year, -8 high pressure summit brand braided stainless. It looked at though it may had rubbed the bottle bracket so I did not think much of it. This weekend however, same -8 (just a bit shorter now) popped again at an event pulling it off the trailer. There were no signs of running and all the braided was in perfect shape. According to summit it was E85 friendly (non PTFE) when I bought it. I am at a point where I think I need to redo all the lines on the truck. Question is, PTFE or mostly hard line? __________________ ------Motor---------------Bottle 60'---1.53---------------1.41 1/8---6.58 @ 105.92----5.87 @ 118.41 1/4---10.38 @ 126.97----9.24 @ 142.49

01-05-2016, 01:17 AM	#8
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	Re: PTFE vs Rubber line fittings Hard line as much as possible IMO. Every hose system can be adapted to and from hard tube, and anything from Kerosene to pure Methanol wont hurt it. __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

04-03-2013, 05:06 PM	#1
BR3W CITY meowMEOWmeowMEOW Join Date: Sep 2009 Location: MKE WI Posts: 7,128	PTFE vs Rubber line fittings Help me out here guys, I've never even touched PTFE in a project before. I decided to re-do some parts of my fuel system that had regular Fuel injection rubber line, since the NHRA rule doesn't seem to like that stuff The rest of my system is mostly -6 AN braided stainless rubber-core line, and was assembled like I'm used to. But on ordering some new -8 AN stuff for part of the feed, I somehow ordered (or was sent) -8 PTFE. To make it more confusing, the two -8 fittings I ordered are from 2 manufacturers and look completely different. Fitting #1 they sent me, -8 straight swivel AN fitting with the connection type I'm used to (small threads all the way up). Fitting #2 from Aeroquip; -8 90* swivel, but with an end that has a ferrule on it. Here is the hose I'm guessing I can't use all this stuff together. Should I return the ptfe hose and find the regular rubber core to use fitting style #1 like I'm used to...or should I return fitting #1 and find a straight -8 that matches the style of fitting #2? __________________ *'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING* MY BUILD THE H8RDCPTR //\\ MY YOUTUBE CHANNEL REV J HD

04-03-2013, 09:52 PM	#2
Marv D Registered Truck Offender Join Date: May 2008 Location: hells training ground (aka Ariz) Posts: 3,118	Re: PTFE vs Rubber line fittings I would returmn the ptfe stuff. It's for ultra high pressure (brake lines and P.S. hose ) I run a 58psi Magnafuel system on the LS buggy with regular ol an-6 with no hint of leaks or weeping For whatever thats worth. Just an opinion __________________ Still playin with trucks, even at my age! When you're dead, it's only a problem for the people around you, because you don't know you're dead. .....It's kinda the same when your STUPID. I just did my taxes and reviewed my SS statement. Thanks to the current administration it looks like I will only have to work till noon on the day of my funeral.

01-07-2016, 11:08 AM	#9
hotrod 80 mini truck racer Join Date: Aug 2006 Location: Baytown , texas Posts: 3,010	Re: PTFE vs Rubber line fittings Some of the older rubber lined hose will "melt" after a while . The newer stuff seems alcohol resistant . I have all newer stuff and have had no problems . I am also E85 . I don't see how you get the fuel uphill in the last picture. __________________ 1949 5-window 1969 Camaro 1976 Chevy Luv yellow 1978 Chevy Luv Blue 1976 Chevy Luv Black 1979 Firebird Flooded in Harvey 1999 F350 Dually 2005 GMC Sierra 4.8 RCSB 2014 Explorer (wifes) My build :http://67-72chevytrucks.com/vboard/s...d.php?t=399148 Build #2: http://67-72chevytrucks.com/vboard/s...d.php?t=653583

01-07-2016, 03:03 PM	#10
Super73 Registered User Join Date: Nov 2007 Location: Bay Area, Ca Posts: 2,841	Re: PTFE vs Rubber line fittings Hotrod, I redid mine less than 3 years ago. Summit promised it was the new synthetic hose that was e85 acceptable. __________________ ------Motor---------------Bottle 60'---1.53---------------1.41 1/8---6.58 @ 105.92----5.87 @ 118.41 1/4---10.38 @ 126.97----9.24 @ 142.49

01-07-2016, 04:12 PM	#11
Rannos Registered User Join Date: Feb 2010 Location: New Caney, Texas Posts: 356	Re: PTFE vs Rubber line fittings I ran 1/2" aluminum tubing. Just have to check your connections every now and then because of vibration. Was easy to bend and install.

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