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12-29-2006, 12:17:11 AM
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#1
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Veteran Member
Join Date: May 2000
Location: Los Angeles
Posts: 7,003
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Earls braided lines bleed fuel vapor?
So I'm putting my gas analyzer to use and am now able to truly pinpoint the source of that pesky fuel odor that I'm stuck with.
http://www.nastyz28.com/forum/showthread.php?t=69660
It's definitely the braided lines that I"m using for supply/return. All up and down the lines, when I put the sniffer to them, the HC's shoot up to 40-50 ppm compared to 0-2 ppm for normal air and around the rest of the engine compartment.
WHen I run the engine, I see absolutely no signs of liquid fuel leaking from anywhere along the fuel lines (and at 40 psi, any leak would be readily apparent). So what's the deal? Are the braided lines just porous enough to leak fuel vapors but not liquid fuel itself?
Has anyone heard of this phenomenon with braided lines? Do I need to switch to steel lines now? |
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12-29-2006, 12:33:08 AM
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#3
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SoCal Team Mom for Life
Join Date: Nov 2002
Location: Phoenix
Posts: 8,513
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I'm living with the smell for now considering the cost to replace it all. Damn. 
Good find, you know next time the car is at the shop I'm going to run the smog sniffer over the hose route.
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POS71RS is a gunky
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12-29-2006, 12:35:48 AM
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#4
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Gold Member
Join Date: Jun 2004
Location: CFB Petawawa, Ontario
Posts: 2,648
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wow that's crazy... you never hear about this kinda stuff from the magazines! God bless the internet.. and especially nastyz28 
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Now has ZZ4 short block, wiseco 10:1 forged under brodix IK200s w/ 670 street avenger, 1 3/4 hooker super comps, pypes X 2.5" Pro-V, 200-4R, quicksilver shifter, 3.73 w/ posi. Shootin for 12s.
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12-29-2006, 12:40:49 AM
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#6
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Veteran Member
Join Date: May 2000
Location: Los Angeles
Posts: 7,003
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Quote:
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Originally Posted by Knuckle Dragger
I'm living with the smell for now considering the cost to replace it all. Damn.
Good find, you know next time the car is at the shop I'm going to run the smog sniffer over the hose route. |
Considering Mrs. ULTM8Z won't even go into the garage because it smells so bad (and always worries about me when I do), I don't think I'll have a problem selling this solution to her. |
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12-29-2006, 12:47:27 AM
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#7
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Lifetime Gold Member
Join Date: Aug 2002
Location: Not sure... If ya find me let me know
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Thanks for the heads up. Something to keep in mind when I get to building my fuel delivery system.
Mark
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K5JMP-"We are, after all, only human... alone we suffer. Together we can make it through.
Handle every stressful situation like a dog...If ya cant eat it or play with it...pee on it and walk away...
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12-29-2006, 12:48:37 AM
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#8
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BANNED
Join Date: Mar 2002
Location: Cleveland, OH
Posts: 8,946
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I'm happy that you've found and documented your fuel leak...
Last edited by Mr_Metal : 12-29-2006 at 12:50:38 AM.
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12-29-2006, 12:53:08 AM
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#9
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SoCal Team Mom for Life
Join Date: Nov 2002
Location: Phoenix
Posts: 8,513
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Quote:
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Originally Posted by ULTM8Z
Hmmm... apparently this teflon-lined hose might do the trick.
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Do they use the same fittings as the braided line?
__________________
You'll just have to excuse me for not walking to the beat of your drum
www.jakesperformance.com High performance automotive solutions based on real world experience; a welcome change in the copy and paste world of internet experts.
POS71RS is a gunky
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12-29-2006, 12:56:50 AM
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#10
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Lifetime Gold Member
Join Date: Aug 2002
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of course not Dave... who are you kidding?? where would be the money in that?
__________________
K5JMP-"We are, after all, only human... alone we suffer. Together we can make it through.
Handle every stressful situation like a dog...If ya cant eat it or play with it...pee on it and walk away...
Self appointed president of the GFB fan club"
"On the other side of the cross, the side that no one could see, hung the spirit of things yet to come, hung the future of you and me"
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12-29-2006, 12:59:39 AM
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#11
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Moderator
Join Date: Jul 2001
Location: san bernardino calif
Posts: 11,610
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braided AN fuel line is nothing more than rubber fuel hose wrapped inside a metal braided jacket .so if they're leaking it's because the hose is old and brittle .the only other place i would think it would be leaking is from poor assembly of the fitting onto the hose . i've never heard of this before and have been around alot of race cars using braided line
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12-29-2006, 01:11:41 AM
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#12
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Veteran Member
Join Date: May 2000
Location: Los Angeles
Posts: 7,003
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Quote:
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Originally Posted by muscl car
braided AN fuel line is nothing more than rubber fuel hose wrapped inside a metal braided jacket .so if they're leaking it's because the hose is old and brittle .the only other place i would think it would be leaking is from poor assembly of the fitting onto the hose . i've never heard of this before and have been around alot of race cars using braided line
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If it were a bad connection, the HC spike would be localized to that connection. But for the HC readings to be relatively constand along the entire length of BOTH supply and return lines indicates an apparent uniform degradation or a porosity that's susceptible to local fuel additives around here. My readings in conjunction with what I've just read on the internet have convinced me that the lines themselves are the culprit. |
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12-29-2006, 01:13:23 AM
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#13
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Veteran Member
Join Date: May 2000
Location: Los Angeles
Posts: 7,003
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Quote:
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Originally Posted by Knuckle Dragger
Do they use the same fittings as the braided line?
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Unfortunately, this "Speed-Flex" hose requires Speed-Flex fittings.  Typical... |
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12-29-2006, 09:16:58 AM
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#14
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L. G. M. / Moderator
Join Date: Jun 2002
Location: NoVA
Posts: 7,294
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Have you ever thought about a career in semiconductor equipment troubleshooting?  And, would you like to live in Northern VA?
Nice work! I would never have considered that. |
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12-29-2006, 11:07:55 AM
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#15
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Lifetime Gold Member
Join Date: Mar 1999
Location: Granite Falls, WA
Posts: 2,819
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Would the problem exist with a carb and stock fuel pump?
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