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03-10-2020, 03:16 PM
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Join Date: Dec 2005
Location: San Pedro
Posts: 1,013
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Wow
I'm a novice to AC engine work but it looks to me that anyone who doesn't know the 'pedigree' of his/her fuel lines should seriously consider a compete removal of said fuel lines and verify if they pass a thorough and complete inspection. As said above, it's the little things that can get you but in my opinion, this is not a little thing.
Having said that, can anybody tell me what the composition of factory new ROTAX 912 ULS fuel lines is? I have a new 912 ULS. Maybe I should replace the fuel lines before first start? Rotax says to replace the fuel lines in five years. I will pull and check my fuel lines before first engine start. I think that this is one of those things that go with flying - "if you can't afford to do it right then don't do it al all". Sell your AC before you kill somebody.
Tom???
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Building finally
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03-10-2020, 04:53 PM
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Join Date: Oct 2010
Location: Babylon NY
Posts: 65
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Quote:
Originally Posted by E. D. Eliot
...can anybody tell me what the composition of factory new ROTAX 912 ULS fuel lines is? I have a new 912 ULS. Maybe I should replace the fuel lines before first start? Rotax says to replace the fuel lines in five years.
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If you have a Rotax with S/N 6781191 or higher, all the fuel lines are Teflon and are not subject to the five year rubber replacement cycle. The Rotax part numbers on these Teflon hoses are 874337 and 874347. For more information refer to SI-912-020 R10 and the heavy MM.
FYI, the VA-213,VA-214 and VA-215 oil lines are Teflon too, as is the VA-216 fuel return line.
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03-10-2020, 05:32 PM
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Join Date: Dec 2005
Location: San Pedro
Posts: 1,013
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Thank you, sir
Thanks very much, Mike, I appreciate your very helpful info.
__________________
Building finally
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03-10-2020, 09:04 PM
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Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,589
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Ed---Mike got to this before I did. Still----CHECK the hoses. Just because its teflon doesnt mean its conductive. (Email me)
Larry---Aeroquip FCA hose has their 'elastomer' liner. Now understand their 'performance' racing hose isnt Aviation hose. I'm NOT a chemist, so I dont know the additives in the different fuels, but I would carefully check the hoses often, and replace at least at the 5 year mark. Who knows the actual life expectancy of a non tested hose with AVGAS, that wasnt approved for it.
As you found out, not alot of 'race car' parts suppliers carry conductive teflon. Most industrial shops dont either. (And if you ask for it-they should know EXACTLY what you are going to do with it.) Earls has an aviation disclaimer for its Speedflex hose as do most other non-aviation hose suppliers.
Check fuel filters often-it will start as discolored fuel, then little pepper sized bits. You get the idea.
Tom
__________________
Tom Swearengen, TS Flightlines LLC, AS Flightlines
Joint Venture with Aircraft Specialty
Teflon Hose Assemblies for Experimentals
Proud Vendor for RV1, Donator to VAF
RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
Ridgeland, SC
www.tsflightlines.com, www.asflightlines.com
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03-11-2020, 02:22 AM
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Join Date: Oct 2012
Location: Rocky Point, NY
Posts: 46
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For the record....earl?s speed flex is Teflon liner. In sizes 6 and 8 it is carbon lined for static.
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03-11-2020, 07:02 AM
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Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,589
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You are correct Gordon. It is!
Tom
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Tom Swearengen, TS Flightlines LLC, AS Flightlines
Joint Venture with Aircraft Specialty
Teflon Hose Assemblies for Experimentals
Proud Vendor for RV1, Donator to VAF
RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
Ridgeland, SC
www.tsflightlines.com, www.asflightlines.com
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03-11-2020, 07:32 AM
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Join Date: Sep 2010
Location: Charlotte NC
Posts: 1,166
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I am curious what the weight difference might be on standard lines verses high quality stainless braided lines. Is it significant?
G
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03-11-2020, 09:39 AM
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Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,589
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George, I think Steve actually did a weight comparsion of a firesleeved teflon hose and a comparible length rubber hose. Dont know the actual details off hand, but I'd bet the teflon assemblies are lighter.
Tom
__________________
Tom Swearengen, TS Flightlines LLC, AS Flightlines
Joint Venture with Aircraft Specialty
Teflon Hose Assemblies for Experimentals
Proud Vendor for RV1, Donator to VAF
RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
Ridgeland, SC
www.tsflightlines.com, www.asflightlines.com
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03-19-2020, 10:34 AM
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Join Date: Nov 2005
Location: Davis, CA
Posts: 1,156
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Parker 919B hose ("B" is important) is conductive teflon with stainless overbraid. Compatible field-installable fittings are Parker 90 series; they are typically plated steel in a variety of configurations. Mentioned only for those who are determined to make their own hoses.
I have made many with that stuff, though all for automotive applications. As Tom pointed out, by the time you add firesleeve, and if you value your time greater than zero, you are probably better off buying pre-made hoses from him. Which, having done so, has always been a positive experience. And it pretty much guarantees you won't stab yourself with errant strands of stainless steel wire 
__________________
Lars Pedersen
Davis, CA
RV-7 Flying as of June 24, 2012
960+ hours as of June 30, 2020. Where did the time go?
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03-19-2020, 01:29 PM
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Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,589
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Lars---MOST good domestic industrial teflon hose manufacturers have optional conductive liners. Most shops dont carry it, because in industrial applications its rarely needed. Back in my industrial days, we had it because we built fuel hose assemblies for automotive and marine applications. So instead of having both types, we had the conductive liners in -4 through -10.
Yes the 919B/929B are excellent hoses.
Tom
__________________
Tom Swearengen, TS Flightlines LLC, AS Flightlines
Joint Venture with Aircraft Specialty
Teflon Hose Assemblies for Experimentals
Proud Vendor for RV1, Donator to VAF
RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
Ridgeland, SC
www.tsflightlines.com, www.asflightlines.com
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