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Fuel Venting

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captaindonhopkin(at)aol.c
Guest

Posted: Sat Apr 21, 2007 4:17 am Post subject: Fuel Venting

I'm new to this blog site and don't know if this has been discussed before.  I have a 1980 Yak 52 that will vent fuel, usually from the port wing, unless I leave cracked open the gas cap.  This will happen out on the ramp or inside a hanger.  It will dump a couple of gallons or more.  Has anyone engineered a fix for this?   Thanks

    

   Hoppy

    

   Captain Don Hopkin

         N6868Y

   captaindonhopkin(at)aol.com (captaindonhopkin(at)aol.com)

 

    

    [quote][b]

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dsavarese(at)elmore.rr.co
Guest

Posted: Sat Apr 21, 2007 4:37 am Post subject: Fuel Venting

Don,

 This is a common problem for all pre-1989 Yak 52's with a  single vent line, including mine.  Opening up the fuel caps is typically  the only way to relieve the pressure in the vent line.  Another way to  prevent this from happening is not to fill your fuel tanks until you are ready  to fly.  Most of the time if you have less than 30-35 or so  liters in each tank, the fuel will not vent overboard with the fuel caps locked  down.

  

 The only real solution is to redesign the vent lines from the  fuel tanks to match the 1989 and later fuel vent system, which has an individual  vent line for each fuel tank.  This is not an easy task, but it certainly  is doable.  Attached is an English translated original, early models, fuel  system drawing.

  

 BTW, for the folks on the Yak list, Don's Yak 52 is a very  rare flush riveted Yak 52.  Yes, it came from the factory that  way.

 Dennis

  

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jimscjs(at)mbay.net
Guest

Posted: Sat Apr 21, 2007 6:36 am Post subject: Fuel Venting

My Yak is Flush Rivited also.

 Jim Selby

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captaindonhopkin(at)aol.c
Guest

Posted: Sat Apr 21, 2007 11:36 am Post subject: fuel venting

Dennis,

    

   Thanks again for the quick reponse, as usual.

    

   Hoppy

    

   Captain Don Hopkin

        N6868Y

 

    

    [quote][b]

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rob(at)redyak.demon.nl
Guest

Posted: Sun Apr 22, 2007 3:24 am Post subject: Fuel Venting

Hi Don, Dennis, rest,Maybe this helps:

We have our '86 RedYak 52  since 1996 and off course the same fuel venting problem; especially in direct sun heat with full capped tanks some 5-10 liters will syphon/vent.

Preferably with someone smoking a fag next to the Yak in an airshow static display......



So I 'engeneered' a very simple and cheap 'solution', after trying some other tricks that did not work:



-take tank cap s home and drill an, e.g. M4 or M5 hole in it, then cut thread in it to fit M4 or M5 screw, I used surplus belly screws.

-Take your Dremel tool and slice a partial lenghtwise (so perpendicular to thread) slit in screws.

-unscrew partly when not flying, air and exess fuel will escape through small cut in screw.

-when checking tanks before flight fasten screw, when forgotten: fool proof; only very small amount of fuel will escape during inverted flight or because of underpressure over wing.



After this mod our problem was solved; only little venting from cap due overpressure; no more ( EURO 2,3/lit!!!!!) 5-10 lit's syphononing via center vent under belly.



Total cost: NIL

Time: 2 hours



try it; if it does not work: leave screw tight and no harm done to cap.



fly safe:



Sad to read about the Blues crash, we had them over here at Leeuwarden airbase in Holland last summer and I had a few brewskies with the hero's.......

 

Robert de Vries

Van Struykstraat 2

2203 HE Noordwijk

Holland,Europe

tel/fax:+31-71-3619730

mobile:+31-6-51792046

rob(at)redyak.demon.nl (rob(at)redyak.demon.nl)

www.redyak.tk

[url=skype:redyak]skype:redyak[/url]



 



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