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Bob,
A bewildering list of possibilities.
The original builder put in the Lyc. O-320. The fuel selector is in, but no transfer pumps. (I added them.)
The wing has two extra wires (deleted) but no extra ports.
Will probably try a small, measured amount of water to see if the vent is at tank bottom,and could use it for a sight gage.
Thanks for the info.
Terrence
L235/320 N211AL
----- Original Message ----- From: "bob mackey" <n103md@yahoo.com>
To: <lml@lancaironline.net>
Sent: Wednesday, June 20, 2007 08:25 AM
Subject: [LML] Re: L235 wingtank vents
Terrance writes:
The wing tanks each have two vent outlets. One I have traced
to to top of the tank near the gascap. The other outlet at the
root also vents into the wing tank, as confirmed by pressure buildup,
with cap, outlet and other vent plugged.
I can't find any indication in the builders book of where in the fuel
tank this vent might originate .. i.e. up high, or possibly down low,
perhaps to serve as part of a sight-gage outlet.
The cap, outboard vent, and inboard outlet are standard equipment.
The inboard vent is a bonus. Could have been for a sight gauge,
a fuel return, or to connect to the header tank vent line.
Do you know what engine the initial builder intended to use?
Automotive conversions or fuel systems with regulated fuel pressure
might have a fuel return line. Is the fuel selector valve installed?
Does it have some extra ports that might be for return lines?
A sight gauge could be installed on the back of the nose gear tunnel
where it would be low enough and still visible to the pilot. The stock
fuel system effectively has such a sight gauge in the clear vinyl
tubing specified between the fuel transfer pump and the header tank.
i.e. no extra tubes necessary if you plumb from the wing tank's outlet
to the header tank's vent.
The extra line could also be for the inert gas purge...
-bob mackey
L235/320 #30
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