REFLECTOR:Low fuel light
Rick
reflector@tvbf.org
Sat, 26 Jul 2003 10:15:25 -0000
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Re: REFLECTOR:Low fuel lightIn this same discussion a year or two ago, =
it was determined in one case, that the fuel flow itself towards the =
float was forcing it down, causing the low fuel indication.
Rick
----- Original Message -----=20
From: Brett Ferrell=20
To: reflector@tvbf.org=20
Sent: Saturday, July 26, 2003 1:05 PM
Subject: Re: REFLECTOR:Low fuel light
Why would you jump to the assumption it's air in the tank? Without a =
sightglass, or replacing that run of tubing to the sump neoprene or =
something, we don't have any idea what's causing the indication. Could =
just as easily be a defect inside the instrument. My whole contention =
was that, if air is entering the sump, it's probably for the best b/c =
the alternative is most likely to pull a vacuum on the tank. Air =
doesn't displace fuel without a reason.
Brett
----- Original Message -----=20
From: alventures=20
To: reflector@tvbf.org=20
Sent: Friday, July 25, 2003 5:56 PM
Subject: RE: REFLECTOR:Low fuel light
Al,
This thread started with Rene's problem with occasional low-fuel =
warning with plenty of fuel on board. How is the air getting into the =
sump tank if the strake tanks have enough fuel to keep the =
strake-to-sump fuel lines submerged? The sump vent seems the most =
likely route.
Keith
Yes, I agree with that; assuming of, course, that the intermittent =
warning is due to a low level in the sump tank and not a problem with =
the float switch, or something else.
After giving the issue more thought, the valve in the sump vent =
seems to make sense. Although it is one more thing on the checklist, =
and not convenient to get at. And it doesn't preclude fuel exhaustion =
in the case of a leaky fuel cap. If we are going to keep a simple =
gravity feed system from both tanks, we have to pay attention to the =
fuel caps, and be aware of one tank level dropping faster than the =
other.
Let's see; if we could just find a different place to put the fuel =
cap; someplace that doesn't happen to see about the maximum negative =
pressure of anywhere on the airplane.
Al
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<DIV><FONT face=3DArial size=3D2>In this same discussion a year or two =
ago, it was=20
determined in one case, that the fuel flow itself towards the float was =
forcing=20
it down, causing the low fuel indication.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Rick</FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dbferrell@123mail.net =
href=3D"mailto:bferrell@123mail.net">Brett=20
Ferrell</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dreflector@tvbf.org=20
href=3D"mailto:reflector@tvbf.org">reflector@tvbf.org</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, July 26, 2003 =
1:05=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: REFLECTOR:Low fuel =
light</DIV>
<DIV><BR></DIV>
<DIV><FONT face=3DArial size=3D2>Why would you jump to the assumption =
it's air in=20
the tank? Without a sightglass, or replacing that run of =
tubing to=20
the sump neoprene or something, we don't have any idea what's causing =
the=20
indication. Could just as easily be a defect inside the=20
instrument. My whole contention was that, if air is entering the =
sump,=20
it's probably for the best b/c the alternative is most likely to pull =
a vacuum=20
on the tank. Air doesn't displace fuel without a=20
reason.</FONT></DIV><FONT face=3DArial size=3D2>
<DIV><BR> Brett</DIV>
<DIV></FONT> </DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dalventures@msn.com =
href=3D"mailto:alventures@msn.com">alventures</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dreflector@tvbf.org=20
href=3D"mailto:reflector@tvbf.org">reflector@tvbf.org</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Friday, July 25, 2003 =
5:56=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> RE: REFLECTOR:Low =
fuel=20
light</DIV>
<DIV><BR></DIV>
<DIV class=3DSection1>
<DIV>
<P class=3DMsoNormal style=3D"MARGIN-LEFT: 0.5in"><FONT face=3DArial =
size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">Al,</SPAN></FONT></P></DIV>
<DIV>
<P class=3DMsoNormal style=3D"MARGIN-LEFT: 0.5in"><FONT =
face=3D"Times New Roman"=20
size=3D3><SPAN style=3D"FONT-SIZE: =
12pt"></SPAN></FONT> </P></DIV>
<DIV>
<P class=3DMsoNormal style=3D"MARGIN-LEFT: 0.5in"><FONT face=3DArial =
size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial">This thread started =
with Rene's=20
problem with occasional low-fuel warning with plenty of fuel on =
board. =20
How is the air getting into the sump tank if the strake tanks have =
enough=20
fuel to keep the strake-to-sump fuel lines submerged? The sump =
vent=20
seems the most likely route.</SPAN></FONT></P></DIV>
<DIV>
<P class=3DMsoNormal style=3D"MARGIN-LEFT: 0.5in"><FONT =
face=3D"Times New Roman"=20
size=3D3><SPAN style=3D"FONT-SIZE: =
12pt"></SPAN></FONT> </P></DIV>
<DIV>
<P class=3DMsoNormal style=3D"MARGIN-LEFT: 0.5in"><FONT face=3DArial =
size=3D2><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: =
Arial">Keith</SPAN></FONT></P></DIV>
<DIV>
<P class=3DMsoNormal style=3D"MARGIN-LEFT: 0.5in"><FONT =
face=3D"Times New Roman"=20
size=3D3><SPAN style=3D"FONT-SIZE: =
12pt"></SPAN></FONT> </P></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: =
medium none; PADDING-LEFT: 3pt; PADDING-BOTTOM: 0in; MARGIN: 5pt 0in 5pt =
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<DIV>
<P class=3DMsoNormal style=3D"MARGIN-LEFT: 0.6in"><FONT =
face=3D"Times New Roman"=20
color=3Dblue size=3D3><SPAN style=3D"FONT-SIZE: 12pt; COLOR: =
blue">Yes, I agree=20
with that; assuming of, course, that the intermittent warning is =
due to a=20
low level in the sump tank and not a problem with the float =
switch, or=20
something else.</SPAN></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN-LEFT: 0.6in"><FONT =
face=3D"Times New Roman"=20
color=3Dblue size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt; COLOR: blue"></SPAN></FONT> </P>
<P class=3DMsoNormal style=3D"MARGIN-LEFT: 0.6in"><FONT =
face=3D"Times New Roman"=20
color=3Dblue size=3D3><SPAN style=3D"FONT-SIZE: 12pt; COLOR: =
blue">After giving=20
the issue more thought, the valve in the sump vent seems to make=20
sense. Although it is one more thing on the checklist, and =
not=20
convenient to get at. And it doesn=92t preclude fuel =
exhaustion in the=20
case of a leaky fuel cap. If we are going to keep a simple =
gravity=20
feed system from both tanks, we have to pay attention to the fuel =
caps,=20
and be aware of one tank level dropping faster than the=20
other.</SPAN></FONT></P>
<P class=3DMsoNormal style=3D"MARGIN-LEFT: 0.6in"><FONT =
face=3D"Times New Roman"=20
color=3Dblue size=3D3><SPAN=20
style=3D"FONT-SIZE: 12pt; COLOR: blue"></SPAN></FONT> </P>
<P class=3DMsoNormal style=3D"MARGIN-LEFT: 0.6in"><FONT =
face=3D"Times New Roman"=20
color=3Dblue size=3D3><SPAN style=3D"FONT-SIZE: 12pt; COLOR: =
blue">Let=92s see; if=20
we could just find a different place to put the fuel cap; =
someplace that=20
doesn=92t happen to see about the maximum negative pressure of =
anywhere on=20
the airplane.</SPAN></FONT></P>
<P class=3DMsoNormal><FONT face=3DVerdana color=3Dblue =
size=3D2><SPAN=20
style=3D"FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: =
Verdana"></SPAN></FONT> </P>
<P class=3DMsoNormal><FONT face=3DVerdana color=3Dblue =
size=3D2><SPAN=20
style=3D"FONT-SIZE: 11pt; COLOR: blue; FONT-FAMILY: =
Verdana">Al</SPAN></FONT></P></DIV></BLOCKQUOTE></DIV></BLOCKQUOTE></BLOC=
KQUOTE></BODY></HTML>
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