REFLECTOR:Low fuel light
Brett Ferrell
reflector@tvbf.org
Sat, 26 Jul 2003 09:05:57 -0400
This is a multi-part message in MIME format.
------=_NextPart_000_0429_01C35355.20741570
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
Re: REFLECTOR:Low fuel lightWhy 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
------=_NextPart_000_0429_01C35355.20741570
Content-Type: text/html;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE>Re: REFLECTOR:Low fuel light</TITLE>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 6.00.2800.1170" name=3DGENERATOR>
<STYLE>@font-face {
font-family: Verdana;
}
@page Section1 {size: 8.5in 11.0in; margin: 1.0in 1.25in 1.0in 1.25in; }
P.MsoNormal {
FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman"
}
LI.MsoNormal {
FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman"
}
DIV.MsoNormal {
FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman"
}
A:link {
COLOR: blue; TEXT-DECORATION: underline
}
SPAN.MsoHyperlink {
COLOR: blue; TEXT-DECORATION: underline
}
A:visited {
COLOR: purple; TEXT-DECORATION: underline
}
SPAN.MsoHyperlinkFollowed {
COLOR: purple; TEXT-DECORATION: underline
}
SPAN.emailstyle17 {
COLOR: navy; FONT-FAMILY: Arial
}
SPAN.emailstyle18 {
FONT-WEIGHT: normal; COLOR: blue; FONT-STYLE: normal; FONT-FAMILY: =
Verdana; TEXT-DECORATION: none
}
SPAN.EmailStyle19 {
FONT-WEIGHT: normal; COLOR: blue; FONT-STYLE: normal; FONT-FAMILY: =
Verdana; TEXT-DECORATION: none
}
DIV.Section1 {
page: Section1
}
</STYLE>
</HEAD>
<BODY lang=3DEN-US vLink=3Dpurple link=3Dblue bgColor=3Dwhite>
<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 =
instrument. =20
My whole contention was that, if air is entering the sump, it's probably =
for the=20
best b/c the alternative is most likely to pull a vacuum on the =
tank. Air=20
doesn't displace fuel without a 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 PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> RE: REFLECTOR:Low fuel =
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 fuel=20
to keep the strake-to-sump fuel lines submerged? The sump vent =
seems the=20
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 =
3pt; BORDER-LEFT: black 1.5pt solid; PADDING-TOP: 0in; BORDER-BOTTOM: =
medium none">
<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 =
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, and=20
be aware of one tank level dropping faster than the =
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 the=20
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></BODY=
></HTML>
------=_NextPart_000_0429_01C35355.20741570--