REFLECTOR: fuel system
Keith Hallsten
KeithHallsten at quiknet.com
Sun Feb 3 01:16:54 CST 2008
Noel,
For flaring the aluminum tubing, I used and recommend the Parker
"ROLO-FLARE" tool (see
http://www.aircraftspruce.com/catalog/topages/flaringtools2.php). It works
for every size of tubing you will need.
Be sure that you put the AN 818 nut and AN819 sleeve onto the tubing before
flaring. I also found that a small smear of oil on the flaring surface of
the tool helped to prevent galling of the flared surface.
Keith Hallsten
-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of gattenby at tulsaconnect.com
Sent: Saturday, February 02, 2008 9:07 PM
To: Velocity Aircraft Owners and Builders list
Subject: Re: REFLECTOR: fuel system
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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