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  #1  
Old 04-08-2012, 11:27 PM
tim walter tim walter is offline
 
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Location: san rafael
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Default should fuel line be primed/painted?

Since all non alclad is supposed to be primed
does that mean I should prime/paint the fuel lines?

if so, what color are fuel lines supposed to be?
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  #2  
Old 04-09-2012, 10:08 PM
terrye terrye is offline
 
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Default fuel line marking

If you are using an epoxy primer I would paint them with that and leave as is, I don't think the color matters. Aircraft fluid lines can be marked by tapes whose color, symbol and lettering identify the fluid being carried. In the case of fuel this color is red, as are most fuel tank caps for the same reason. Tapes are available if you should desire, check the internet. See also this resource for fabricating and marking fluid lines.
http://www.faa.gov/library/manuals/a...83-30_Ch07.pdf
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  #3  
Old 04-10-2012, 01:50 AM
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Gagarin737 Gagarin737 is offline
 
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Default

To be honest I never thought about painting the fuel lines and I have never seen one with painted fuel lines.
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  #4  
Old 04-10-2012, 02:05 AM
rgmwa rgmwa is offline
 
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Default

Quote:
Originally Posted by Gagarin737 View Post
To be honest I never thought about painting the fuel lines and I have never seen one with painted fuel lines.
Mine are not painted. Never occurred to me either.
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  #5  
Old 04-10-2012, 10:58 AM
tim walter tim walter is offline
 
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Default overkill

it's probably not necessary since they are always inside the cabin and not exposed to moisture ?
I've never seen them painted either
but it's just 3003 alumimium, not alclad, so technically you would expect it to need priming.
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  #6  
Old 04-10-2012, 10:59 AM
aerhed aerhed is offline
 
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Default

Me neither. They are zinc primated on big birds though.
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  #7  
Old 04-10-2012, 11:07 AM
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JonJay JonJay is offline
 
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Fuel lines can corrode; from the inside out. I just replaced the interior cabin hard lines in my Bucker due to a pinhole that developed. The particular fuel system designed for this airplane had a low point in a reserve fuel line that allowed some contamination to stagnate in the line and over time, some 18 years, it finally developed the pin hole.

I seriously doubt this would occur in a properly maintained and operated RV.
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  #8  
Old 04-10-2012, 03:07 PM
tim walter tim walter is offline
 
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Quote:
Originally Posted by JonJay View Post
Fuel lines can corrode; from the inside out. I just replaced the interior cabin hard lines in my Bucker due to a pinhole that developed. The particular fuel system designed for this airplane had a low point in a reserve fuel line that allowed some contamination to stagnate in the line and over time, some 18 years, it finally developed the pin hole.

I seriously doubt this would occur in a properly maintained and operated RV.
well priming the outside would not have helped in that case anyway.
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  #9  
Old 04-10-2012, 03:14 PM
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fl-mike fl-mike is online now
 
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Default

3003 Aluminum has good corrosion resistance in it's natural state. Fluid lines are typically not coated.

(I did polish some of mine though!)
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  #10  
Old 04-10-2012, 03:25 PM
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JonJay JonJay is offline
 
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Quote:
Originally Posted by tim walter View Post
well priming the outside would not have helped in that case anyway.
Funny, well no, and priming the inside would be hard to do, and not very wise.
Interesting side note. All of the lines are painted on my G.46 projects. They are copper lines, yes, copper throughout, and they are painted for identification. I do not know what the standard is but it is well documented in the manuals and schematics, I just have to learn to read Italian better. Hydraulic lines are one color, fuel another, static, pitot, etc....
It is quite pretty.
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