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Fuel sight tube

 
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william(at)wbliss.co.uk
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PostPosted: Tue Dec 18, 2012 2:59 pm    Post subject: Fuel sight tube Reply with quote

Dear All

My fuel sight tube is about to be renewed. It does not seem to be very
accurate. Is there a more reliable installation position than the pilot
footwell?

Will Bliss G-WUFF

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kevinmarie(at)blueyonder.
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PostPosted: Tue Dec 18, 2012 11:23 pm    Post subject: Fuel sight tube Reply with quote

Will

I installed a fuel flow computer, the tube in my tri gear is useless. The fuel computer won't detect a leak but in normal use its brilliant. Fuel left in the tank, range left, time left. An alarm when it's time to switch to the reserve.

Kevin
On 18 Dec 2012, at 22:58, "William Bliss" <william(at)wbliss.co.uk> wrote:

Quote:


Dear All

My fuel sight tube is about to be renewed. It does not seem to be very
accurate. Is there a more reliable installation position than the pilot
footwell?

Will Bliss G-WUFF



-----
No virus found in this message.
Checked by AVG - www.avg.com







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phillik747



Joined: 04 Apr 2012
Posts: 73
Location: Birminham, AL USA

PostPosted: Wed Dec 19, 2012 6:23 am    Post subject: Re: Fuel sight tube Reply with quote

Bud Yearly has a different option on his page however I have no experience with this setup, yet...

The fuel totalizer is the way to go in my opinion.

http://www.customflightcreations.com/id21.html


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Kyle
Europa Tri-gear (under construction)
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graeme bird



Joined: 15 Jul 2010
Posts: 434

PostPosted: Wed Dec 19, 2012 12:05 pm    Post subject: Re: Fuel sight tube Reply with quote

My two tubes were at the back of the baggage bay (not extended) but a) they are affected by the flatness of ground and b) move with roll c) cant see them when seated and when there is stuff in the back.
So I changed it to a single one and moved it to between the seats close to the Centre line and to the tank. I also added a airworld fuel gauge and flow and return flow sensors and an EP 5 flow & fuel flow/quantity/mpg gauge.

I think the tube and EP 5 would be the minimum.


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Graeme Bird
kit4 (Wagstaff) TBD
Kit3 G-CLXU (Gregory) mono 914 xs Woodcomp
Kit2 G-PATS - (kesterton) Mono Classic 912 warpdrive
Kit 1 G-UMPY - Mono Classic/XS 912S, Woodcomp G(@)gdbmk.co.uk
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budyerly(at)msn.com
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PostPosted: Fri Dec 28, 2012 11:18 am    Post subject: Fuel sight tube Reply with quote

<?xml:namespace prefix="v" /><?xml:namespace prefix="o" /><![endif]--> [img]cid:020b01cde52f$5BDF7992(at)goldfishbk2xxe[/img][img]cid:020c01cde52f$5BDF7992(at)goldfishbk2xxe[/img] Photo E-mail [url=https://skydrive.live.com/redir.aspx?cid=2161856909618aa7&page=play&resid=2161856909618AA7!300&type=5&authkey=!ADE17rtw2HovWOQ]View slideshow [/url]| [url=https://skydrive.live.com/redir.aspx?cid=2161856909618aa7&page=downloadphotos&resid=2161856909618AA7!300&type=5&authkey=!ADE17rtw2HovWOQ]Download images [/url] Will,
Your sight gauge woes are common. Attached is a visual of what the problem is. Essentially any fuel trapped in the vent side of your sight system above the fuel tank fuel level adversely affects the fuel level in the clear sight tube.

Not to insult intelligence of anyone, but the only way to keep the sight tube vent side clear is to run it uphill all the way to the vent. I personally don't like the overhead vent because the low pressure area over the top of the aircraft creates changes in the sight tube level also. To remove some of that problem, I prefer folks to put a tee in the fill neck to allow the tank and the sight tube to be the same air pressure. That said, running the sight tube vent side so that fuel can never be trapped in the line on a mono or trigear is very difficult. At times for a tail dragger, it is impossible. I have a sight gauge in my trigear that works flawlessly. But it runs above the tank, downhill from the top of the fill tube. But it still can get fuel in my vent side. I know mono owners that have very accurate sight tubes but took great care not to trap fuel in their upper line. Following Chapter 30 of the build manual, it shows a method to run the foot mounted sight tube and it works well normally at cruise speed.

Most government regulations on aircraft require some means to visually determine the amount of fuel in the fuel tanks by the pilot during preflight because electronic gauges and senders are prone to their own inaccuracies. I have a sight gauge, a fuel quantity gauge, a fuel totalizer, and a wrist watch and knowledge of my engine's fuel usage per hour. I also carry a small piece of tubing which inserts into the inside of the fuel neck on to the tee to blow out any trapped fuel that some line boy fueling my aircraft injected into my sight gauge line. Talk about the department of redundant redundancy.

In the analysis from years of tinkering on quite a few aircraft: The Europa electric fuel gauge works pretty well for a resistance unit. The capacitance types work OK unless you change fuel from 100LL to auto fuel as the capacitance is different leading to inaccuracies. Fuel flow senders work generally well.
On my 914 I have a JPI. If I set the fuel on the totalizer accurately, it is dead on accurate. The Grand Rapids dual flow are OK but require a bit of setup tinkering then are quite good. The 912 and 912S do not use a return flow meter and are OK but no system on these engines works perfect, but it is close. Dynon newer systems like the Skyview use dual fuel senders and seem OK, but all the older units can only use one sender and are fairly accurate on the 912 series engines. Sight gauges are a necessity to assure you that you have sufficient fuel to complete a mission unless you always top off before any flight and land well before a fuel low situation. I just never find myself in those circumstances...

Regards,
Bud Yerly
Tech Support


[url=https://skydrive.live.com/redir.aspx?cid=2161856909618aa7&page=play&resid=2161856909618AA7!301&parid=2161856909618AA7!300&type=1&authkey=!ADE17rtw2HovWOQ][img]cid:020d01cde52f$5BDF7992(at)goldfishbk2xxe[/img][/url]

[url=https://skydrive.live.com/redir.aspx?cid=2161856909618aa7&page=play&resid=2161856909618AA7!302&parid=2161856909618AA7!300&type=1&authkey=!ADE17rtw2HovWOQ][img]cid:020e01cde52f$5BDF7992(at)goldfishbk2xxe[/img][/url]











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