Today's Message Index:
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1. 12:00 PM - Re: Fuel return line / Firewall seal (Craig Payne)
2. 02:41 PM - Zenair Newsletter (Tommy Walker)
Message 1
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| Subject: | Fuel return line / Firewall seal |
There is some debate about whether the return line is needed. Certainly
there are 701/912s flying without it. I think most would agree that it
is
more needed if you intend to burn car gas as it is more susceptible to
vapor
lock.
Note that there is a restrictor at the start of the return line. In the
factory Rotax setup you can see this in the exploded diagram labeled
=93Fuel
lines, airbox, fuel PSI control unit=94. I=92m looking at the top
diagram (for
the 912) on page 68 of the current Lockwood catalog. The part called out
as
#10 or #13 has a Rotax part number of 963-820 and a description of
=93Pilot
jet 35=94.
I was looking at Quality Sport Planes=92 701 at Arlington yesterday.
They have
a large metal block on the cabin-side of the firewall (say 2 by 3 by =BD
inches?). Doug Dugger says this is where their return line runs to.
I=92ve
attached a pair of bad pictures I shot. Unfortunately I only could
photograph the cabin side. I think the plug at the top caps a hole that
was
drilled down into the block to form the passage where the two lines on
the
firewall side join with the fitting from the tanks.
I don=92t know who supplied this block. Did it come with the new (ring
mount)
Zenith FWF? Doug said the block (or something like it) was available
from
Spruce.
Of course the return line makes installing and calibrating a fuel flow
sensor trickier.
-- Craig
From: owner-zenith701801-list-server@matronics.com
[mailto:owner-zenith701801-list-server@matronics.com] On Behalf Of
philip
smith
Sent: Wednesday, July 09, 2008 9:51 AM
Subject: Zenith701801-List: Fuel return line / Firewall seal
Greetings again,
Ready to plumb the fuel system on my 701 with Rotax 912 ULS. The Home
Built
Help DVD makes a statement "that you have to run a return line" from the
fitting on the top of the fuel manifold back to "the line running from
the
wing fuel tank". First, is this line necessary? Second instead of
running a line all the way back could I run it to the "primer port" on
the
Spruce Gascolator I'm installing on the Firewall or to the line just
after
the gascolator and before the "fuel line" provided by Rotax to the
engine
pump ? Your thoughts on this please.
I have designed a firewall seal system that uses silicone cowl seal -
the
one with fiberglass - available from Spruce and aluminum from my scrap
box.
I haven't had it through taxi and or flight test but the design seems to
give me the side to side and up and down travel necessary with the
ability
to allow the rods to move through the steering arc. Interested email me
at
madriver@wildblue.net - if enough are interested I'll publish the pics
and a
narrative on this site.
Thanks Phil
Message 2
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| Subject: | Zenair Newsletter |
Listers,
I got my Archived Zenair Newsletter today. I am very impressed with the job Jon
did in scanning all those old newsletters into a useable format. That is really
good Jon.
I've got enough reading material to last me for the next several months. I picked
up a tip about using a mercury or sodium vapor light to check rpm. Very interesting
reading.
Thanks again,
Tommy Walker in Alabama
do not archive
--------
Tommy Walker
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=192318#192318
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