I will try William's idea of running the sight gage tube all the way up to
the top of
the filler neck. I really don't see why that would make any difference but
its worth a try!
I have the little holes drilled in back of the vent inlets. I thought
that would fix my
problem but no change. I don't understand Williams thought that the filler
neck
vent might be acting as a pitot tube as I have a flush fitting fuel cap. I
have no vent
directly on the filler tube that I know of. Thanks, William!
Glenn
>From: "William Mills" <william@wrmills.plus.com>
>Reply-To: europa-list@matronics.com
>To: <europa-list@matronics.com>
>Subject: Re: Europa-List: Monowheel sight gauge
>Date: Sun, 1 Oct 2006 06:41:02 +0100
>
><william@wrmills.plus.com>
>
>Jos and Glenn,
>I have had the sight tube between the seats of my mono for about 800 hours
>of flying now and it is totally reliable as a backup for the fuel computer
>if certain measures are taken to keep the horizontal section of tube free
>from slugs of fuel.
>I keep the sight tube vent separate right up to the filler neck so it is
>not influenced by anything else. (Glenn, the fuel return line could bubble
>vapour into the gauge and push fuel into the horizontal section, also is
>the filler neck vent acting as a pitot and pressurising the tube when
>flying? Have you forgotten to drill the little hole facing aft?)
>I also have an on / off valve in the sight gauge tube where it tees into
>the port side water drain at the tank entry point. This is necessary to
>stop fuel from being pushed up the tube into the horizontal section when
>filling the tank, because without it the sight tube acts as a another vent
>to the tank when being filled. The gauge must of course be calibrated with
>the port door sill horizontal so when the tail is on the ground it shows
>less fuel than actual. If a slug of fuel gets trapped in the horizontal
>section it will distort the gauge fuel level, because the air trapped above
>the fuel level is unlikely to be at atmospheric pressure.
>Hope that helps.
>William
>
>----- Original Message ----- From: "GLENN CROWDER" <gcrowder2@hotmail.com>
>To: <europa-list@matronics.com>
>Sent: Saturday, September 30, 2006 5:20 PM
>Subject: Re: Europa-List: Monowheel sight gauge
>
>
>>
>> I have routed my sight gauge identically and it works great on the
>>ground, but
>>in the air the fuel goes down in the sight gauge by about 3-4 gal. If I
>>route the
>>vent into my fuel return line at the top of the tank instead of the fuel
>>tank breather
>>tube, I get the same results so the sight guage is pretty worthless while
>>flying.
>>
>> Glenn
>>>From: "josok" <josok-e@ukolo.fi>
>>>Reply-To: europa-list@matronics.com
>>>To: europa-list@matronics.com
>>>Subject: Re: Europa-List: Monowheel sight gauge
>>>Date: Sat, 30 Sep 2006 13:30:46 +0300
>>>
>>>
>>>Hi Ron,
>>>
>>>I decided to route the tube up the seatback, back in the seatback over
>>>the tank, and up to the breather tube. The reason is that i will be able
>>>to see the fuel level while tanking. The breather tube is connected to
>>>the top of the filler and has it's opening behind the flap extension. You
>>>will get the idea of the latter from the attached picture, where you see
>>>the vent system. This is one of the good ideas of Graham Singleton. I am
>>>still thinking of adding a one way valve there opening in the cockpit, to
>>>have a second vent in case the primary one gets blocked.
>>>
>>>Kind Regards,
>>>
>>>Jos Okhuijsen
>>>
>>>
>>>
>>>
>>>-------------------- m2f --------------------
>>>
>>>Visit - www.EuropaOwners.org
>>>http://www.europaowners.org/viewtopic.php?p=12828#12828
>>>
>>>-------------------- m2f --------------------
>>>
>>>
>>>Attachments:
>>>http://www.europaowners.org//zfiles/img_2454_459.jpg
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>
>>
>>
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