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Fuel venting

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fklein(at)orcasonline.com
Guest

Posted: Sun Jul 01, 2007 9:43 am Post subject: Fuel venting

I understand that some builders have vented the tank and the sight 

gauge to the top of the fuel filler pipe, taking care that the precise 

location will not allow fuel being added to inadvertantly flow into the 

vents. What I don't understand is...using the supplied fuel filler cap 

(which is specifically called out as "non-venting", again in the ACS 

catalogue)...how such an arrangement in fact can act to vent the fuel 

system.



Can anyone enlighten me?



Fred

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Ivor Phillips

Joined: 16 Jan 2006
Posts: 253
Location: London UK

Posted: Sun Jul 01, 2007 10:55 am Post subject: Fuel venting

Hi Fred

I used a vent valve TRV86 in the top of the filler with a AN fitting

taken down to just forward of the flap tube,

http://www.thinkauto.com/

information on web site

sent photo's direct!



regards

Ivor



--

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johnwigney(at)alltel.net
Guest

Posted: Mon Jul 02, 2007 6:09 am Post subject: Fuel venting

Hi Fred,



I vented the tank to the neck since I was unhappy with the standard vent 

arrangement. The main problem I found was that the vent tube from the 

tank was too small and caused the fill pipe to back up and burp at low 

fill rates from a hose. The vent pipe also vented fuel onto the top of 

the fuselage. The changes I made have worked out well and consist of the 

following steps :-



    * Modified the vent fitting at the tank so that I could use a larger

      vent tube size (clear plastic tubing with fabric reinforcement,

      3/8" dia I think. I can check if you wish).

    * Installed a tee fitting at the top neck of the filler. This was

      bonded into place with Redux.

    * The center leg of the tee is connected into the filler neck which

      was drilled to suit. One other leg is connected to the tank vent

      tubing and the third leg is sized for the original small tubing

      and goes directly to the vent on the fuselage top.

    * Another feature which helps during filling is that I have a 2"

      section in the middle of  the fuel down pipe which is left

      unpainted. This makes it easy to check filling progress. I can now

      fill at basically the full flow rate and I do not get any fuel

      vented onto the fuselage top.



I do not use a sight gauge arrangement. I have two capacitance fuel 

gauges plus my Grand Rapids EIS flowmeter and totaliser.



Cheers, John

N262WF, mono XS, 912S

Mooresville, North Carolina



ORIGINAL MESSAGE

Subject: Fuel venting

From: Fred Klein <fklein(at)orcasonline.com>

I understand that some builders have vented the tank and the sight 

gauge to the top of the fuel filler pipe, taking care that the precise 

location will not allow fuel being added to inadvertantly flow into the 

vents. What I don't understand is...using the supplied fuel filler cap 

(which is specifically called out as "non-venting", again in the ACS 

catalogue)...how such an arrangement in fact can act to vent the fuel 

system.

Can anyone enlighten me?

Fred

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topglock(at)cox.net
Guest

Posted: Mon Jul 02, 2007 7:16 am Post subject: Fuel venting

Fred,



My aircraft is vented, per the manuel, with one deviation.  I added a 

"T" at the top of the filler tube, that allows fuel to spill out into 

the filler neck, before reaching the top of the aircraft.  Keeps gas 

from spilling out on my paint.



Jeff - Baby Blue

300+ hours and in for 2nd annual...



Fred Klein wrote:

 	  Quote: 	
		   



 I understand that some builders have vented the tank and the sight 

 gauge to the top of the fuel filler pipe, taking care that the precise 

 location will not allow fuel being added to inadvertantly flow into 

 the vents. What I don't understand is...using the supplied fuel filler 

 cap (which is specifically called out as "non-venting", again in the 

 ACS catalogue)...how such an arrangement in fact can act to vent the 

 fuel system.



 Can anyone enlighten me?



 Fred

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s.vestuti(at)virgin.net
Guest

Posted: Mon Jul 02, 2007 1:13 pm Post subject: Fuel venting

Hi John , i notice that you are still using the vent in the fuselage top, so, are you getting any fuel stains or spills over the fuselage from the vent when you are full of fuel to the Filler Cap and in The Climb? I am in the process of "drawing up" a similar arrangement to you except using two "ninties" and venting to the fuselage bottom - it would be eaisier for me to use my existing "roof" vent as in your arrangement , but, i need to know if your getting fuel spills when "full to the filler cap" with your arrangement,



steve vestuti #573 G-CEBV

approx 25Hrs of absolutly fantasic flying   .

Visit -  www.EuropaOwners.org

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paul.mcallister

Joined: 09 Jan 2006
Posts: 177
Location: Waukesha, WI USA

Posted: Mon Jul 02, 2007 1:46 pm Post subject: Fuel venting

Fred,



I have done pretty well the same as John has.  Take a look at

http://europa363.versadev.com/ under July 2002 and you will see a bunch of

photographs.



I didn't use the sight gauge as the general theme on the forum was that it

was pretty well useless.  I used a system designed by Tony K that measures

the weight of fuel in the tank with a pressure transducer, analogue to

digital converter and a microprocessor to display the tank contents on a 10

segment LED display.  It works nicely.  Its most a back up to my fuel

totalizer in my GRT EIS



Paul

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