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  #1  
Old 11-29-2016, 05:10 AM
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s10sakota s10sakota is offline
 
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Default 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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  #2  
Old 11-29-2016, 05:19 AM
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I used steel.
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Old 11-29-2016, 05:24 AM
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Mark Dickens Mark Dickens is offline
 
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I used steel for all of the fuel line connections fwf.
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  #4  
Old 11-29-2016, 05:25 AM
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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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  #5  
Old 11-29-2016, 06:17 AM
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Default AN960 washers

Quote:
Originally Posted by s10sakota View Post
...what washers did you use?
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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  #6  
Old 11-29-2016, 07:34 AM
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Quote:
Originally Posted by snopercod View Post
Also, if you are going to install sound insulation on the aft of the firewall, that can block access. Like they say, PLAN AHEAD
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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  #7  
Old 11-29-2016, 08:13 AM
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Quote:
Originally Posted by DanH View Post
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.
+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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  #8  
Old 11-29-2016, 09:44 AM
rapid_ascent rapid_ascent is offline
 
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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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  #9  
Old 11-29-2016, 10:20 AM
David Paule David Paule is offline
 
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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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  #10  
Old 11-29-2016, 11:32 AM
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Default Flame Retardant per FAR 25.853a Appendix F, Pt1

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Originally Posted by Toobuilder View Post
I also did a burn test...
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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