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Date: Wed, 20 Jun 2007 12:52:17 -0400
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From: "terrence o'neill" <troneill@charter.net>
References: <list-2120897@logan.com>
Subject: Re: [LML] Re: L235 wingtank vents
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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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