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  #1  
Old 04-16-2013, 08:56 PM
fabricflyer fabricflyer is offline
 
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Default Fuel line assembly through firewall

I was going to install fuel line AN fitting thru firewall, and got to looking at the plans, which I have inserted below.
They show putting the firewall doubler on motor side of firewall with the AN833 going through it, then the AN spacer washer and nut.
Wouldn't it be better to put the AN spacer washer on the back side of the firewall since the firewall is so thin?


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Old 04-17-2013, 05:28 AM
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cfiidon cfiidon is offline
 
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Default NO

I can only tell you what I did on my -8. Put the doubler on the aft side of the firewall, and the spacer washer on the firewall side.

Don
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Old 04-17-2013, 08:39 AM
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Same here, I put the doubler on the aft side on my 9A.
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Old 04-17-2013, 10:07 AM
Sig600 Sig600 is offline
 
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I'm working on my firewall right now, and the way I read those was doubler aft.
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Old 04-17-2013, 10:22 AM
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The doubler is defiantly on the cabin side of the firewall spacer and nut on the engine side.
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Old 04-17-2013, 10:48 AM
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I may be wrong but according to my -8 distructions on drawing op-34 only shows an 6d spacer and I have one on each side. I do see the doubler on op 32 for the -7
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Old 04-17-2013, 12:10 PM
fabricflyer fabricflyer is offline
 
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I don't known which ones are building an 8 or 7, but on a 7 the doubler is on the engine side. Two of the holes in the doubler are riveted to the vertical firewall brace as seen below. Therefore the doubler can't go behind the firewall.
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Old 04-17-2013, 01:40 PM
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I followed the plans, but moved the location down slightly to clear the starter solenoid.



Bulkhead fittings like this have more threads out towards the flared end and that is why you need the thick spacer to take up some of those threads. The doubler would interfere with the interior angle braces on the firewall, so it makes sense to put this on the engine side of the firewall and tie into it for strength.
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Old 04-17-2013, 02:02 PM
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Sorry now I am confused. I thought this doubler was installed during firewall construction on the aft side. Does this not penetrate the same doubler as the electric fuel pump?
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Old 04-17-2013, 02:25 PM
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jmjula jmjula is offline
 
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This thread is about the fuel line for a fuel injected engine, the doubler you are referring to on the inside is only used a carburetor and associated pump which is quite a different setup. That doesn't get installed on an FI setup.

Quote:
Originally Posted by MarkW View Post
Sorry now I am confused. I thought this doubler was installed during firewall construction on the aft side. Does this not penetrate the same doubler as the electric fuel pump?
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