REFLECTOR:Low fuel light
Rene Dugas
reflector@tvbf.org
Thu, 24 Jul 2003 17:52:47 -0500
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Thanks Ronnie,
I also changed my lines to 3/8th except the sump which is 1/4th=94 and =
the
tube exiting the belly is =BD=94 the a PCV valve =93T=94ed into the line =
on the
firewall.
Will pursue. Last 6 hrs of flying pressure drop only occurred for less
than 3 second the whole time. Very difficult to diagnose.
Rene=92
=20
-----Original Message-----
From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org] On
Behalf Of Ronnie Brown
Sent: Wednesday, July 23, 2003 6:44 PM
To: reflector@tvbf.org
Subject: Re: REFLECTOR:Low fuel light
=20
Rene,
=20
You have something really strange going on there. I can think of no
good reasons for what is happening. I would be concerned about the low
fuel pressure. You should have at least 25 psi at all times, especially
at low fuel flows. My fuel pressure is always greater than 25 psi,
usually around 27, under all conditions, even idling.
=20
The flashing low sump light combined with the low fuel pressure tells me
that there is some sort of restriction somewhere, probably in the vent
system. =20
=20
My vent system (173 Elite) is similar to yours, all three tanks tied
together to a common vent, then the vent goes out the belly, cut toward
the front, but mine only sticks out about 3/4 inch. (I did change my
vent system to 3/8" tubing, like my Cessna 172.- rather than 1/4" that
was specified in the manual ). I also added a one way check valve teed
into the vent line going to the bottom of the fuselage just in case a
mud dauber got into my vent.
=20
I'd keep trouble shooting until you find the cause. Let us know what
you find.
=20
Ronnie
=20
=20
----- Original Message -----=20
From: Rene Dugas <mailto:rdugas@bayou.com> =20
To: reflector@tvbf.org=20
Sent: Wednesday, July 23, 2003 6:20 PM
Subject: REFLECTOR:Low fuel light
=20
My Esteemed Colleagues(Experimenters),
My low fuel light mounted on the panel attacked to the left upper sump
mounted switch comes on in flashes on almost every flight. It never
stays on but flashes on in smooth air at cruise mostly but not always
over 170 kts. My vent exits the bottom just upstream from the sump and
sticks out 1.5 inches with a small bevel to the front and 1/8th inch
vent holes x 4 on the draft side. My tanks all connect to a single
manifold then exit as per plans out of the belly. I have tested my tank
caps and find no leak. I have disassembled the caps and lubricated the
two =93o=94 rings. I have extended the vent tube further into the lower
slip stream from =BD inch to 1.5 inches with no change. The light has
never come on at high fuel flows at low speeds. Usually occurs at lean
cruise around 13 to 13.5 gal/hr. IO 540. Engine never falters. Fuel
pressure occasionally drops below 16 PSI and the Vision system activates
the warning for a single two second cycle the pressure is restored to
about 21 psi. =20
Ideas?
Thanks,
Rene=92
N129RD
XL RG
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<div class=3DSection1>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;color:navy'>Thanks Ronnie,</span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;color:navy'>I also changed my lines to 3/8<sup>th</sup> except =
the sump
which is 1/4<sup>th</sup>” and the tube exiting the belly is =
=BD” the
a PCV valve “T”ed into the line on the =
firewall.</span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;color:navy'>Will pursue.=A0 Last 6 hrs of flying pressure drop =
only occurred
for less than 3 second the whole time.=A0 Very difficult to =
diagnose.</span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;color:navy'>Rene’</span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;color:navy'> </span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dblack
face=3DTahoma><span =
style=3D'font-size:10.0pt;font-family:Tahoma;color:windowtext'>-----Origi=
nal
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> Wednesday, July 23, =
2003
6:44 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:.5in'><font size=3D3 =
color=3D"#663333"
face=3DArial><span style=3D'font-size:12.0pt'> </span></font></p>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dblack
face=3D"Times New Roman"><span =
style=3D'font-size:10.0pt;font-family:"Times New Roman";
color:windowtext'>Rene,</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
color=3Dblack
face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt;font-family:"Times New Roman";
color:windowtext'> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dblack
face=3D"Times New Roman"><span =
style=3D'font-size:10.0pt;font-family:"Times New Roman";
color:windowtext'>You have something really strange going on =
there. I can
think of no good reasons for what is happening. I would be =
concerned
about the low fuel pressure. You should have at least 25 psi at =
all
times, especially at low fuel flows. My fuel pressure is always =
greater
than 25 psi, usually around 27, under all conditions, even =
idling.</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
color=3Dblack
face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt;font-family:"Times New Roman";
color:windowtext'> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dblack
face=3D"Times New Roman"><span =
style=3D'font-size:10.0pt;font-family:"Times New Roman";
color:windowtext'>The flashing low sump light combined with the low fuel
pressure tells me that there is some sort of restriction somewhere, =
probably in
the vent system. </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
color=3Dblack
face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt;font-family:"Times New Roman";
color:windowtext'> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dblack
face=3D"Times New Roman"><span =
style=3D'font-size:10.0pt;font-family:"Times New Roman";
color:windowtext'>My vent system (173 Elite) is similar to yours, all =
three
tanks tied together to a common vent, then the vent goes out the belly, =
cut
toward the front, but mine only sticks out about 3/4 inch. (I did =
change
my vent system to 3/8" tubing, like my Cessna 172.- rather than =
1/4"
that was specified in the manual ). I also added a one =
way
check valve teed into the vent line going to the bottom of the fuselage =
just in
case a mud dauber got into my vent.</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
color=3Dblack
face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt;font-family:"Times New Roman";
color:windowtext'> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dblack
face=3D"Times New Roman"><span =
style=3D'font-size:10.0pt;font-family:"Times New Roman";
color:windowtext'>I'd keep trouble shooting until you find the =
cause. Let
us know what you find.</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
color=3Dblack
face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt;font-family:"Times New Roman";
color:windowtext'> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
color=3Dblack
face=3D"Times New Roman"><span =
style=3D'font-size:10.0pt;font-family:"Times New Roman";
color:windowtext'>Ronnie</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
color=3Dblack
face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt;font-family:"Times New Roman";
color:windowtext'> </span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
color=3Dblack
face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt;font-family:"Times New Roman";
color:windowtext'> </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 =
color=3Dblack
face=3DArial><span style=3D'font-size:10.0pt;color:windowtext'>----- =
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
color=3Dblack face=3DArial><span =
style=3D'font-size:10.0pt;color:windowtext;
font-weight:bold'>From:</span></font></b><font size=3D2 =
color=3Dblack><span
style=3D'font-size:10.0pt;color:windowtext'> <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 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;color:windowtext;font-weight:bold'>To:</span></=
font></b><font
size=3D2 color=3Dblack><span =
style=3D'font-size:10.0pt;color:windowtext'> <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 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;color:windowtext;font-weight:bold'>Sent:</span>=
</font></b><font
size=3D2 color=3Dblack><span =
style=3D'font-size:10.0pt;color:windowtext'> Wednesday,
July 23, 2003 6:20 PM</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><b><font size=3D2 =
color=3Dblack
face=3DArial><span =
style=3D'font-size:10.0pt;color:windowtext;font-weight:bold'>Subject:</sp=
an></font></b><font
size=3D2 color=3Dblack><span =
style=3D'font-size:10.0pt;color:windowtext'>
REFLECTOR:Low fuel light</span></font></p>
</div>
<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
color=3Dblack
face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt;font-family:"Times New Roman";
color:windowtext'> </span></font></p>
</div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
color=3D"#663333"
face=3D"Trebuchet MS"><span =
style=3D'font-size:12.0pt;font-family:"Trebuchet MS"'>My
Esteemed Colleagues(Experimenters),</span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
color=3D"#663333"
face=3D"Trebuchet MS"><span =
style=3D'font-size:12.0pt;font-family:"Trebuchet MS"'>My
low fuel light mounted on the panel attacked to the left upper sump =
mounted
switch comes on in flashes on almost every flight. It never stays =
on but
flashes on in <u>smooth air</u> at cruise mostly but not always over 170
kts. My vent exits the bottom just upstream from the sump and =
sticks out
1.5 inches with a small bevel to the front and 1/8<sup>th</sup> inch =
vent holes
x 4 on the draft side. My tanks all connect to a single manifold =
then
exit as per plans out of the belly. I have tested my tank caps and =
find
no leak. I have disassembled the caps and lubricated the two
“o” rings. I have extended the vent tube further into =
the
lower slip stream from =BD inch to 1.5 inches with no change. The =
light has
never come on at high fuel flows at low speeds. Usually occurs at =
lean
cruise around 13 to 13.5 gal/hr. IO 540. Engine never
falters. Fuel pressure occasionally drops below 16 PSI and the =
Vision
system activates the warning for a single two second cycle the pressure =
is
restored to about 21 psi. </span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
color=3D"#663333"
face=3D"Trebuchet MS"><span =
style=3D'font-size:12.0pt;font-family:"Trebuchet =
MS"'>Ideas?</span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
color=3D"#663333"
face=3D"Trebuchet MS"><span =
style=3D'font-size:12.0pt;font-family:"Trebuchet =
MS"'>Thanks,</span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
color=3D"#663333"
face=3D"Trebuchet MS"><span =
style=3D'font-size:12.0pt;font-family:"Trebuchet =
MS"'>Rene’</span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
color=3D"#663333"
face=3D"Trebuchet MS"><span =
style=3D'font-size:12.0pt;font-family:"Trebuchet =
MS"'>N129RD</span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
color=3D"#663333"
face=3D"Trebuchet MS"><span =
style=3D'font-size:12.0pt;font-family:"Trebuchet MS"'>XL
RG</span></font></p>
</blockquote>
</div>
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