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Scooter
Joined: 10 Jan 2006
Posts: 155
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 Posted: Sun Nov 26, 2006 6:30 am Post subject: Fuel Tank Venting |
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My left tank seems to have trouble venting. Occasionally when i pop off the fuel cap i hear a "whoosh" of air (getting sucked in I think). It also doesn't seem to feed like it should. Can anyone describe how these tanks are vented? There is a vent tube in the bottom of the fuselage but I'm not sure exactly where it goes. I don't have the diagram in front of me but I thought it T'ed and went to each wing tank? I would assume it would go to the top of each tank.
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dsavarese(at)elmore.rr.co
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| Posted: Sun Nov 26, 2006 7:53 am Post subject: Fuel Tank Venting |
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Scooter,
The vent system on the pre-1989 Yak 52's is flawed. IE: it will siphon fuel
out the fuel tanks on hot days because the vent system is joined between the
tanks below the front seat on the left side. From there, the vent line goes
forward and loops up around and behind the front instrument panel and then
back down to the vent tube below the front seat under the belly of the
airplane. Later model 52's have two separate vent lines which do not oppose
themselves when a tank is venting.
Attach a piece of hose to the vent tube under the belly and make it long
enough so you can stand in front of the wing and blow into the tube while
listening for air venting out of the fuel tank. You want to be able to hear
air bubbles coming out of the fuel tank vent line through the fuel cap. Do
only one side at a time and make sure the opposite side fuel tank has the
fuel cap secure. If you do not hear air venting though the fuel cap, there
is a restriction in that specific tank's vent line.
The bubbling you will hear is the fuel trapped in the loop of the vent
lines. This is normal.
Dennis
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david(at)warbirdrebuilder
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| Posted: Sun Nov 26, 2006 11:33 am Post subject: Fuel Tank Venting |
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Note: when you "blow" into the tube check that the pressure is not too high
and that the caps are off the tanks
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dsavarese(at)elmore.rr.co
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| Posted: Sun Nov 26, 2006 7:11 pm Post subject: Fuel Tank Venting |
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Only remove one cap at a time when you blow into the tube. Not both. Mouth
pressure will not be too high.
Dennis
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Scooter
Joined: 10 Jan 2006
Posts: 155
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| Posted: Tue Nov 28, 2006 11:47 am Post subject: Re: Fuel Tank Venting |
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Thanks again. Did that and found no obstructions.
| dsavarese(at)elmore.rr.co wrote: | Scooter,
Attach a piece of hose to the vent tube under the belly and make it long
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dsavarese(at)elmore.rr.co
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| Posted: Tue Nov 28, 2006 1:05 pm Post subject: Fuel Tank Venting |
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There is a possibility the one way check valve at the T connection below the
front seat might be the problem. Put about 8 oz of MMO (Marvel Mystery Oil)
in both tanks per 15 gallons and do this religiously for the near future and
see if it changes the fuel feeding from the left tank. The left tank on
most Yak 52's feeds first, then the right tank starts feeding, according to
the fuel instrument. My personal airplane feeds down to about 45 liters
(sometimes 40 liters) on the left tank before the right one comes off of 60
liters. Been that way for 7 years now and the airplane fly's perfectly
straight with no yawing, hands off.
Dennis
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