REFLECTOR:Low fuel light

Rene Dugas reflector@tvbf.org
Wed, 23 Jul 2003 17:20:51 -0500


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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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<p class=3DMsoNormal><font size=3D3 color=3D"#663333" face=3D"Trebuchet =
MS"><span
style=3D'font-size:12.0pt'>My Esteemed =
Colleagues(Experimenters),</span></font></p>

<p class=3DMsoNormal><font size=3D3 color=3D"#663333" face=3D"Trebuchet =
MS"><span
style=3D'font-size:12.0pt'>My low fuel light mounted on the panel =
attacked to the
left upper sump mounted switch comes on in flashes on almost every =
flight.=A0 It
never stays on but flashes on in <u>smooth air</u> at cruise mostly but =
not
always over 170 kts.=A0 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.=A0 My tanks all connect to a single =
manifold
then exit as per plans out of the belly.=A0 I have tested my tank caps =
and find
no leak.=A0 I have disassembled the caps and lubricated the two =
&#8220;o&#8221;
rings.=A0 I have extended the vent tube further into the lower slip =
stream from =BD
inch to 1.5 inches with no change.=A0 The light has never come on at =
high fuel
flows at low speeds.=A0 Usually occurs at lean cruise around 13 to 13.5 =
gal/hr.=A0 IO
540.=A0 Engine never falters.=A0 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.=A0 </span></font></p>

<p class=3DMsoNormal><font size=3D3 color=3D"#663333" face=3D"Trebuchet =
MS"><span
style=3D'font-size:12.0pt'>Ideas?</span></font></p>

<p class=3DMsoNormal><font size=3D3 color=3D"#663333" face=3D"Trebuchet =
MS"><span
style=3D'font-size:12.0pt'>Thanks,</span></font></p>

<p class=3DMsoNormal><font size=3D3 color=3D"#663333" face=3D"Trebuchet =
MS"><span
style=3D'font-size:12.0pt'>Rene&#8217;</span></font></p>

<p class=3DMsoNormal><font size=3D3 color=3D"#663333" face=3D"Trebuchet =
MS"><span
style=3D'font-size:12.0pt'>N129RD</span></font></p>

<p class=3DMsoNormal><font size=3D3 color=3D"#663333" face=3D"Trebuchet =
MS"><span
style=3D'font-size:12.0pt'>XL RG</span></font></p>

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