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11-29-2016, 05:10 AM
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Join Date: Feb 2005
Location: Westland, MI
Posts: 311
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Fuel line firewall fittings
I would be interested to see how you guys pass the fuel line through the firewall. Do you use the blue aluminum AN fittings or Steel fittings?

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11-29-2016, 05:19 AM
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Join Date: Jan 2005
Location: Tampa, FL
Posts: 2,861
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I used steel.
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Todd "I drink and know things" Stovall
PP ASEL-IA
RV-10 N728TT - Flying!
WAR EAGLE!
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11-29-2016, 05:24 AM
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Join Date: Apr 2012
Location: Collierville, TN (KFYE)
Posts: 1,433
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I used steel for all of the fuel line connections fwf.
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RV-8 #81077 Super Slow Build
Dynon Skyview HDX, Titan IOX-370, Dual P-Mags, AFP FM200A FI, Whirlwind 200RV CS Prop
First Flight 11/20/2016
www.marksrv8.com
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11-29-2016, 05:25 AM
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Join Date: Feb 2005
Location: Westland, MI
Posts: 311
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As a follow up question: if you used these, either alum or steel, what washers did you use? I didn't see any washers listed on AircraftSpruce with the fittings, and I don't really want to use cheap Home Depot washers.
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11-29-2016, 06:17 AM
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Join Date: Aug 2016
Location: Asheville, NC
Posts: 2,104
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AN960 washers
Quote:
Originally Posted by s10sakota
...what washers did you use?
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I used steel fittings, standard AN960 flat washers, and steel AN924 nuts. One thing I would like to mention is that in order to keep the bulkhead fitting from spinning, you will need will need a backup wrench on the back side of the fitting. Be thinking ahead about how you are going to get a backup wrench on the back side while you are torquing the B-nut on the front side. Also, if you are going to install sound insulation on the aft of the firewall, that can block access. Like they say, PLAN AHEAD
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11-29-2016, 07:34 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,500
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Quote:
Originally Posted by snopercod
Also, if you are going to install sound insulation on the aft of the firewall, that can block access. Like they say, PLAN AHEAD
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Don't apply sound insulation to the cabin side of a firewall. Doing so creates a flame transfer system, defeating the reason for having a firewall in the first place.
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Dan Horton
RV-8 SS
Barrett IO-390
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11-29-2016, 08:13 AM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,652
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Quote:
Originally Posted by DanH
Don't apply sound insulation to the cabin side of a firewall. Doing so creates a flame transfer system, defeating the reason for having a firewall in the first place.
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+1
Thanks largely to your "foot stomping" of this issue Dan, I have spent considerable time scraping the foil and foam insulation off my Rocket (applied by the builder, not me).
I also did a burn test on the remnants and WOW! what an eye opener!
Not only did it burn readily, but it produced enough acrid smoke that I almost passed out watching it burn in the yard. Even without fire, I would almost certainly been overcome immediately in an enclosed cabin.
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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11-29-2016, 09:44 AM
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Join Date: Mar 2008
Location: Dublin, CA
Posts: 1,261
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I know some will say no need and that I unnecessarily added weight but I made my doubler out of stainless. I don't want the aluminum spacers melting and the fitting becoming loose. I also plan the run stainless tubing back to the fuel filter.
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Ray Tonks
2020 Donation Paid
Titan IOX-370, Dual PMAGs, 9.6:1 Pistons, FM-150
RV-7 Fuselage in progress
* Cabin Interior - In progress
RV-7 SB Wings
* Both Wings fully skinned
* Fuel Tanks Complete - No leaks finally
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* Flaps Complete
RV-7 Empennage - Complete (a little fiberglass work left)
Vans Training Kit # 2 - Complete
RV-7 Preview Plans
Vans Training Kit #1 - Complete
EAA Sheet Metal Class - Complete
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11-29-2016, 10:20 AM
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Join Date: Dec 2009
Location: Boulder, CO
Posts: 4,435
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Here's the requirement for certified airplanes:
"23.1183 Lines, fittings, and components.
(a) Except as provided in paragraph (b) of this section, each component, line, and fitting carrying flammable fluids, gas, or air in any area subject to engine fire conditions must be at least fire resistant...."
There's considerably more to it than this excerpt.
Dave
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11-29-2016, 11:32 AM
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Join Date: Aug 2016
Location: Asheville, NC
Posts: 2,104
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Flame Retardant per FAR 25.853a Appendix F, Pt1
Quote:
Originally Posted by Toobuilder
I also did a burn test...
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That was prudent since you didn't know what the original builder used. The "Super Soundproofing" that ACS sells is flame retardant per FAR 25.853a Appendix F, Pt1. Whether that's good enough, I don't know (and hope to never find out). All I do know is that without the soundproofing, ATC was unable to reliably hear my transmissions due to the high cabin noise.
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