REFLECTOR:Low fuel light
Rene Dugas
reflector@tvbf.org
Thu, 24 Jul 2003 17:51:44 -0500
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Thanks,
My tanks have never varied more than 4 gallons side to side except when
descending for landing from over 5000 ft. when the fuel flow to the
front of the tanks. My Vision fuel gages are in the very back of the
tanks so they will occasionally read zero in a 1000 ft/min descent but
fuel is still feeding from the front lines and the low fuel light has
never come on in that situation.
Rene'
-----Original Message-----
From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org] On
Behalf Of Chuck Jensen
Sent: Thursday, July 24, 2003 7:08 AM
To: 'reflector@tvbf.org'
Subject: RE: REFLECTOR:Low fuel light
Good stuff on the vent system. I've been greasing (petro jelly) the O
rings on the fuel caps but didn't even think about the O ring on the
locking lever. During a long cruise, I'll get a 9 gallon indicated
differential between the tanks, so these efforts might reduce that
differential. I wasn't too concerned as I understand some differential
is almost expected.
Though I've never gone there, what happens when left tank is 0 and the
right is 9 gallons? Will the rest of the fuel draw from the right tank
or will I have to pull off on the side of the road and hitch a ride for
gas? I'd hate to think I was carrying 9-10 gallons of useless ballast in
my tanks but I'm not (intentionally) going to find out. Anyone been
there, done that?
Chuck
XL RG 540
-----Original Message-----
From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On
Behalf Of Ronnie Brown
Sent: Thursday, July 24, 2003 7:46 AM
To: reflector@tvbf.org
Subject: Re: REFLECTOR:Low fuel light
I think the two primary reasons for the fuel tank imbalance are (1)
airplane flying out of trim, i.e. one wing low; (2) a fuel tank cap
leak.
Enlarging the vent system to 3/8" instead of the original 1/4" will
greatly improve the impacts from (2) a leaking fuel cap. 3/8 tubing
has double the area of a 1/4" tube and will pass twice as much air. The
reason this matters is that we are only talking about 2 feet of fuel
level from the bottom of the sump to the top of the tanks. This is less
than 1 psi. It doesn't take much of a cap leak to pull a slight vacuum
on that tank which causes that tank to fill up. Keep those O rings
vaselined and also make sure the cap is pulling all the way down (adjust
the lock nut on the back side of the cap). There is also a small O ring
on the shaft of the locking lever that needs to be lubricated. If you
want to check how tightly your caps are sealing, connect a tube to the
vent line, blow in it (keep the pressure less than 1 psi!) and spray the
caps with a water-dish detergent mixture.
The original Velocity design had separate vents for each tank - which
led to lots of problems. It is impossible to create two vent outlets
that have the same static pressure at 200 mph!!! Hence the single vent
system now used. It is also important that the vent tubing slope upward
to the manifold or you can trap some fuel and create a tank vent
pressure imbalance which will lead to different fuel levels in the tank.
Ronnie
----- Original Message -----
From: KeithHallsten <mailto:KeithHallsten@quiknet.com>
To: reflector@tvbf.org
Sent: Wednesday, July 23, 2003 11:20 PM
Subject: Re: REFLECTOR:Low fuel light
Yes! Everything you say "SHOULD" be true. Unfortunately, we continue
to get these reports from the flying population regarding odd behavior
of the fuel/vent system!
I think that at times the vent system supplies air to the sump tank just
a TINY bit more easily than the longer path through the strakes supplies
fuel to the sump tank. It's probably a transient event, just persisting
long enough to actuate the "low fuel" warning and scare the bejesus out
of the pilot. I see little risk in shutting the vent line to the sump
tank, thereby assuring that the flow into the sump tank must come from
the strake tanks.
----- Original Message -----
From: Ronnie Brown <mailto:romott@adelphia.net>
To: reflector@tvbf.org
Sent: Wednesday, July 23, 2003 6:55 PM
Subject: Re: REFLECTOR:Low fuel light
If the vent lines slope upward to the manifold from the three tanks,
there shouldn't be any problems trapping air or fuel. The fuel should
go down and the vent air goes up. And the fuel in the sump tank vent
should seek the same level as in the fuel in the main tanks, thereby
keeping the sump tank full and the alarm off.
Ronnie
----- Original Message -----
From: KeithHallsten <mailto:KeithHallsten@quiknet.com>
To: reflector@tvbf.org
Sent: Wednesday, July 23, 2003 8:51 PM
Subject: Re: REFLECTOR:Low fuel light
Rene',
I'm not flying yet, so my comments can be discounted accordingly. I
plan to install a manual vent shut-off valve between the sump tank and
the vent manifold. The result will be that the vent system can allow
the main strake tanks to drain, but can't introduce air into the sump
tank. I have a theory that the vent line to the sump tank causes more
problems than it solves, once the initial "burp" of air is allowed to
escape from the sump tank (before engine start).
Keith Hallsten
----- Original Message -----
From: Rene Dugas <mailto:rdugas@bayou.com>
To: reflector@tvbf.org
Sent: Wednesday, July 23, 2003 4:00 PM
Subject: RE: REFLECTOR:Low fuel light
Thanks Jack,
I felt that maybe the boundary layer was causing a vacuum allowing air
to enter the sump but not the tanks. I don not want to over pressure my
tanks and rupture them at high pressures. I can splice a gage into the
line but wanted to glean info from the informed (flying) few. Since all
three tanks are connected to the manifold I remain perplexed. Thanks
for the info on the Vision. Two engine builders told me significant
fluctuations with the engine pump are common but no pressure numbers
were available. I talked to Lycoming. He air might be in the line but
I don't see how. Thanks
Rene'
-----Original Message-----
From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org] On
Behalf Of Jack Sheehan
Sent: Wednesday, July 23, 2003 4:35 PM
To: reflector@tvbf.org
Subject: Re: REFLECTOR:Low fuel light
Rene'
I can not say much about the low fuel light except that I have not had
that on my XL-RG and I am not extending the vent. Mine is as you
described in the plumbing except the vent line under the belly is cut
off almost flush with the fuselage. I have tested my sump warning light
durin the test flight period by getting pretty low on fuel and then
pushing the nose over and maintain a dive for enough time for the sump
light to start to flicker The low pressure warning from the VM1000 is a
common indication. I have spoken with Vision micro about it and the good
news is the VM1000 is working fine and the bad news is the lack of
pressure is real. it is the way the lycoming pump works and if you have
an analog system with low sensitivity you never see it. They have sent
me a snubber to install in the sensor line which will in theory reduce
thesensitivity. ther is a similar snubber device in the manifold
pressure system. I will let you know when I get some free time to
install it.
Jack
N55XL
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<div class=3DSection1>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Thanks,</span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>My tanks have never varied more =
than 4
gallons side to side except when descending for landing from over 5000 =
ft. when
the fuel flow to the front of the tanks. My Vision fuel gages are =
in the very
back of the tanks so they will occasionally read zero in a 1000 ft/min =
descent
but fuel is still feeding from the front lines and the low fuel light =
has never
come on in that situation.</span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Rene’</span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'> </span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'>-----Original =
Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b> =
reflector-admin@tvbf.org
[mailto:reflector-admin@tvbf.org] <b><span style=3D'font-weight:bold'>On =
Behalf
Of </span></b>Chuck Jensen<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Thursday, July 24, =
2003 7:08
AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> =
'reflector@tvbf.org'<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> RE: =
REFLECTOR:Low fuel
light</span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dblue face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:blue'>Good stuff on =
the vent
system. I've been greasing (petro jelly) the O rings on the fuel =
caps but
didn't even think about the O ring on the locking lever. During a =
long
cruise, I'll get a 9 gallon indicated differential between the tanks, so =
these
efforts might reduce that differential. I wasn't too concerned as =
I
understand some differential is almost expected.</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dblue face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:blue'>Though I've =
never gone
there, what happens when left tank is 0 and the right is 9 =
gallons? Will
the rest of the fuel draw from the right tank or will I have to pull off =
on the
side of the road and hitch a ride for gas? I'd hate to think I was =
carrying
9-10 gallons of useless ballast in my tanks but I'm not (intentionally) =
going
to find out. Anyone been there, done that?</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dblue face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:blue'>Chuck</span></fon=
t></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dblue face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:blue'>XL RG =
540</span></font></p>
</div>
<blockquote =
style=3D'margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
<p class=3DMsoNormal =
style=3D'margin-right:0in;margin-bottom:12.0pt;margin-left:
.5in'><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma'>-----Original
Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b> =
reflector-admin@tvbf.org
[mailto:reflector-admin@tvbf.org]<b><span style=3D'font-weight:bold'>On =
Behalf Of
</span></b>Ronnie Brown<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Thursday, July 24, =
2003 7:46
AM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> =
reflector@tvbf.org<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> Re: =
REFLECTOR:Low fuel
light</span></font></p>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3D"Times New Roman"><span
style=3D'font-size:10.0pt'>I think the two primary reasons for the fuel =
tank
imbalance are (1) airplane flying out of trim, i.e. one wing low; (2) a =
fuel
tank cap leak.</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3D"Times New Roman"><span
style=3D'font-size:10.0pt'>Enlarging the vent system to 3/8" =
instead of the
original 1/4" will greatly improve the impacts from (2) =
a
leaking fuel cap. 3/8 tubing has double the area of a 1/4" =
tube and
will pass twice as much air. The reason this matters is that we =
are only
talking about 2 feet of fuel level from the bottom of the sump to the =
top of
the tanks. This is less than 1 psi. It doesn't take much of =
a cap
leak to pull a slight vacuum on that tank which causes that tank to fill
up. Keep those O rings vaselined and also make sure the cap is =
pulling
all the way down (adjust the lock nut on the back side of the =
cap). There
is also a small O ring on the shaft of the locking lever that needs to =
be
lubricated. If you want to check how tightly your caps are =
sealing,
connect a tube to the vent line, blow in it (keep the pressure less than =
1
psi!) and spray the caps with a water-dish detergent =
mixture.</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3D"Times New Roman"><span
style=3D'font-size:10.0pt'>The original Velocity design had separate =
vents for
each tank - which led to lots of problems. It is impossible to =
create two
vent outlets that have the same static pressure at 200 mph!!! =
Hence the
single vent system now used. It is also important that the vent =
tubing
slope upward to the manifold or you can trap some fuel and create a tank =
vent
pressure imbalance which will lead to different fuel levels in the =
tank. </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3D"Times New Roman"><span
style=3D'font-size:10.0pt'>Ronnie </span></font></p>
</div>
<blockquote style=3D'border:none;border-left:solid black =
1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'=
>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>----- Original Message =
----- </span></font></p>
</div>
<div style=3D'font-color:black'>
<p class=3DMsoNormal =
style=3D'margin-left:.5in;background:#E4E4E4'><b><font size=3D2
face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>From:</span=
></font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> <a
href=3D"mailto:KeithHallsten@quiknet.com" =
title=3D"KeithHallsten@quiknet.com">KeithHallsten</a>
</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><b><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>To:</span><=
/font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> <a
href=3D"mailto:reflector@tvbf.org" =
title=3D"reflector@tvbf.org">reflector@tvbf.org</a>
</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><b><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>Sent:</span=
></font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> Wednesday,
July 23, 2003 11:20 PM</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><b><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>Subject:</s=
pan></font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> Re:
REFLECTOR:Low fuel light</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>Yes! Everything you =
say
"SHOULD" be true. Unfortunately, we continue to get =
these
reports from the flying population regarding odd behavior of the =
fuel/vent
system! </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>I think that at times the =
vent
system supplies air to the sump tank just a TINY bit more easily than =
the
longer path through the strakes supplies fuel to the sump tank. =
It's
probably a transient event, just persisting long enough to actuate the
"low fuel" warning and scare the bejesus out of the =
pilot. I
see little risk in shutting the vent line to the sump tank, thereby =
assuring
that the flow into the sump tank must come from the strake =
tanks.</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'> =
</span></font></p>
</div>
<blockquote style=3D'border:none;border-left:solid black =
1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'=
>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>----- Original Message =
----- </span></font></p>
</div>
<div style=3D'font-color:black'>
<p class=3DMsoNormal =
style=3D'margin-left:.5in;background:#E4E4E4'><b><font size=3D2
face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>From:</span=
></font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> <a
href=3D"mailto:romott@adelphia.net" title=3D"romott@adelphia.net">Ronnie =
Brown</a> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><b><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>To:</span><=
/font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> <a
href=3D"mailto:reflector@tvbf.org" =
title=3D"reflector@tvbf.org">reflector@tvbf.org</a>
</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><b><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>Sent:</span=
></font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> Wednesday,
July 23, 2003 6:55 PM</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><b><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>Subject:</s=
pan></font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> Re:
REFLECTOR:Low fuel light</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3D"Times New Roman"><span
style=3D'font-size:10.0pt'>If the vent lines slope upward to the =
manifold from
the three tanks, there shouldn't be any problems trapping air or =
fuel.
The fuel should go down and the vent air goes up. And the fuel in =
the
sump tank vent should seek the same level as in the fuel in the main =
tanks,
thereby keeping the sump tank full and the alarm =
off.</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3D"Times New Roman"><span
style=3D'font-size:10.0pt'>Ronnie</span></font></p>
</div>
<blockquote style=3D'border:none;border-left:solid black =
1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'=
>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>----- Original Message =
----- </span></font></p>
</div>
<div style=3D'font-color:black'>
<p class=3DMsoNormal =
style=3D'margin-left:.5in;background:#E4E4E4'><b><font size=3D2
face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>From:</span=
></font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> <a
href=3D"mailto:KeithHallsten@quiknet.com" =
title=3D"KeithHallsten@quiknet.com">KeithHallsten</a>
</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><b><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>To:</span><=
/font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> <a
href=3D"mailto:reflector@tvbf.org" =
title=3D"reflector@tvbf.org">reflector@tvbf.org</a>
</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><b><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>Sent:</span=
></font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> Wednesday,
July 23, 2003 8:51 PM</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><b><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>Subject:</s=
pan></font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> Re:
REFLECTOR:Low fuel light</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>Rene',</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>I'm not flying yet, so my =
comments
can be discounted accordingly. I plan to install a manual vent =
shut-off
valve between the sump tank and the vent manifold. The result will =
be
that the vent system can allow the main strake tanks to drain, but can't
introduce air into the sump tank. I have a theory that the vent =
line to
the sump tank causes more problems than it solves, once the initial
"burp" of air is allowed to escape from the sump tank (before =
engine
start).</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>Keith =
Hallsten</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'> </span></font></=
p>
</div>
<blockquote style=3D'border:none;border-left:solid black =
1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'=
>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>----- Original Message =
----- </span></font></p>
</div>
<div style=3D'font-color:black'>
<p class=3DMsoNormal =
style=3D'margin-left:.5in;background:#E4E4E4'><b><font size=3D2
face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>From:</span=
></font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> <a
href=3D"mailto:rdugas@bayou.com" title=3D"rdugas@bayou.com">Rene =
Dugas</a> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><b><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>To:</span><=
/font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> <a
href=3D"mailto:reflector@tvbf.org" =
title=3D"reflector@tvbf.org">reflector@tvbf.org</a>
</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><b><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>Sent:</span=
></font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> Wednesday,
July 23, 2003 4:00 PM</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><b><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;font-weight:bold'>Subject:</s=
pan></font></b><font
size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;font-family:Arial'> RE:
REFLECTOR:Low fuel light</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
</div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:navy'>Thanks =
Jack,</span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:navy'>I felt that =
maybe the
boundary layer was causing a vacuum allowing air to enter the sump but =
not the
tanks. I don not want to over pressure my tanks and rupture them =
at high
pressures. I can splice a gage into the line but wanted to glean =
info
from the informed (flying) few. Since all three tanks are =
connected to
the manifold I remain perplexed. Thanks for the info on the =
Vision.
Two engine builders told me significant fluctuations with the engine =
pump are
common but no pressure numbers were available. I talked to
Lycoming. He air might be in the line but I don't see how. =
Thanks </span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dnavy face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial;color:navy'>Rene'</span></fon=
t></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
<p class=3DMsoNormal style=3D'margin-left:1.0in'><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'>-----Original =
Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b> =
reflector-admin@tvbf.org
[mailto:reflector-admin@tvbf.org] <b><span style=3D'font-weight:bold'>On =
Behalf
Of </span></b>Jack Sheehan<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Wednesday, July 23, =
2003
4:35 PM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> =
reflector@tvbf.org<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> Re: =
REFLECTOR:Low fuel
light</span></font></p>
<p class=3DMsoNormal style=3D'margin-left:1.0in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'> </span></font></p>
<div>
<p class=3DMsoNormal style=3D'margin-left:1.0in'><font size=3D3 =
color=3D"#663333"
face=3D"Trebuchet MS"><span =
style=3D'font-size:12.0pt;font-family:"Trebuchet MS";
color:#663333'>Rene'</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:1.0in'><font size=3D3 =
color=3D"#663333"
face=3D"Trebuchet MS"><span =
style=3D'font-size:12.0pt;font-family:"Trebuchet MS";
color:#663333'>I can not say much about the low fuel light except that I =
have
not had that on my XL-RG and I am not extending the vent. Mine is as you
described in the plumbing except the vent line under the belly is cut =
off
almost flush with the fuselage. I have tested my sump warning light =
durin the
test flight period by getting pretty low on fuel and then pushing the =
nose over
and maintain a dive for enough time for the sump light to start to =
flicker The
low pressure warning from the VM1000 is a common indication. I have =
spoken with
Vision micro about it and the good news is the VM1000 is working fine =
and the
bad news is the lack of pressure is real. it is the way the lycoming =
pump works
and if you have an analog system with low sensitivity you never see it. =
They
have sent me a snubber to install in the sensor line which will in =
theory
reduce thesensitivity. ther is a similar snubber device in the manifold
pressure system. I will let you know when I get some free time to =
install it.</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:1.0in'><font size=3D3 =
color=3D"#663333"
face=3D"Trebuchet MS"><span =
style=3D'font-size:12.0pt;font-family:"Trebuchet MS";
color:#663333'>Jack</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:1.0in'><font size=3D3 =
color=3D"#663333"
face=3D"Trebuchet MS"><span =
style=3D'font-size:12.0pt;font-family:"Trebuchet MS";
color:#663333'>N55XL</span></font></p>
</div>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</blockquote>
</div>
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