REFLECTOR: fuel system

gattenby at tulsaconnect.com gattenby at tulsaconnect.com
Sat Feb 2 23:06:44 CST 2008


attached is a pic of what I did... fwiw
Drilling and tapping that 1/4" al plate is a pain.
Wish I had found those "welding flanges"

I haven't ran any of the aluminum line yet.
I assume that I'll need to flare the end of the tubing / 
use a special nut.

Anyone care to educate me as to the process and what tools 
that I'll need?

Noel

On Sat, 2 Feb 2008 14:54:33 -0600
  "Grigore Rosu" <grigore.rosu at gmail.com> wrote:
> Thank you for your answers on the finger strainer; I 
>guess I'll install the
> hardpoint and the finger strainer.  This is very 
>frustrating, though,
> because it means one more week of waiting until the 
>strainers come; I
> thought I could finish it this weekend.
> 
> I'd like to ask another question, this time about the 
>venting line.
> 
> The attached picture shows where the 3/8'' hole for the 
>vent line comes in
> my SEFG (just drilled it).  Note that I built a little 
>foam-supported flange
> on the fuselage to support the top strake.  The flanges 
>are not sanded yet.
> To get my vent as high as possible, I had to drill 
>through that foam.  I
> inserted a 3/8'' aluminum line in the hole to make it 
>more visible in the
> picture.
> 
> The manual calls for a hardpoint for the venting line on 
>the fuselage.
>First, there are no such hardpoint parts in my kit. 
> Second, the manual says
> nothing about what happens from that hardpoint inside 
>the fuel tank.  Are we
> supposed to just let an open hole there?  How can we 
>make sure that no leaks
> find there way around that hole?  In case we are 
>supposed to seal that hole
> with jeffco, it still appears to be difficult to make 
>sure no pin holes are
> left, not to mention that it can be difficult, or in my 
>case impossible, to
> paint the inside of the hole.
> 
> I find it strange that the manual does not require a 
>hardpoint for the fuel
> line, but it does requires a hardpoint for the venting 
>line.  Since at this
> moment my hole trough the fuselage and the 
>flange-supported foam for the
> venting line has about 2.5'' in legth, I'm thinking of 
>doing the following:
> 
> 1) enlarge the hole to 1/2''
> 2) bond the pipe with structural adhesive all the way 
>throught the long hole
> and 4-5 inches in the tank
> 3) even though I don't see why it would be necessary in 
>this case, I can
> also place a 1'' x 1' x 1/8'' hardpoint on the interior 
>of the fuselage that
> would bond the aluminum line even better.
> 4) use no AN blue connectors for the vent lines on the 
>fuselage; in other
> words, take the vent lines all the way from the manifold 
>to fuel tanks,
> bonding them properly on the fuselage.
> 
> Does anybody see any problem with my approach above?
> 
> I understand that the connector is useful on the fuel 
>line in order to take
> out and clean the finger strainer, but why would the 
>connector be useful on
> the venting line?
> 
> Thank you,
> Grigore

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