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bscruggs(at)charter.net
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 Posted: Sat May 31, 2014 4:17 am Post subject: Uneven fuel tank flow |
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My Yak 52 fuel tanks will not drain from both evenly. It’s not a small difference, last flight 50 L on one side, 20 L on the other by end of a 1.1 hr flight. Any thoughts on how to remedy this situation?
Bill
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Dawg
Joined: 19 May 2013
Posts: 355
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| Posted: Sat May 31, 2014 4:24 am Post subject: Uneven fuel tank flow |
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Rudder.
On May 31, 2014, at 6:17, "Bill Scruggs" <bscruggs(at)charter.net (bscruggs(at)charter.net)> wrote:
[quote] <![endif]--> <![endif]-->
My Yak 52 fuel tanks will not drain from both evenly. It’s not a small difference, last flight 50 L on one side, 20 L on the other by end of a 1.1 hr flight. Any thoughts on how to remedy this situation?
Bill
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dsavarese0812(at)bellsout
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| Posted: Sat May 31, 2014 4:28 am Post subject: Uneven fuel tank flow |
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The problem is most likely the vent system caused by when you fill the tanks and fuel getting into the vent line. OR by fuel expansion due to the heating. Just a poor design on the pre-'89 model Yak 52's. Usually the right vent line fills with fuel and causes the right tank not to feed properly. You can "step on the full tank" and fly level, holding that position for a minute or two and usually the fuel in the vent line will work its way out and the tank will begin feeding.
As Bill said, use the rudder.
Dennis
| Quote: | A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1 |
On 5/31/2014 7:17 AM, Bill Scruggs wrote:
[quote] <![endif]--> <![endif]-->
My Yak 52 fuel tanks will not drain from both evenly. It’s not a small difference, last flight 50 L on one side, 20 L on the other by end of a 1.1 hr flight. Any thoughts on how to remedy this situation?
Bill
[b]
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Ernie
Joined: 11 Jan 2006
Posts: 513
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| Posted: Sat May 31, 2014 4:45 am Post subject: Uneven fuel tank flow |
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Bill,
Contact me off list
On Saturday, May 31, 2014, Bill Geipel <l129bs(at)gmail.com (l129bs(at)gmail.com)> wrote:
[quote] Rudder.
On May 31, 2014, at 6:17, "Bill Scruggs" <[url=javascript:_e(%7B%7D,'cvml','bscruggs(at)charter.net');]bscruggs(at)charter.net[/url]> wrote:
| Quote: |
My Yak 52 fuel tanks will not drain from both evenly. It’s not a small difference, last flight 50 L on one side, 20 L on the other by end of a 1.1 hr flight. Any thoughts on how to remedy this situation?
Bill
et="_blank">http://www.matronics.com/Navigator?Yak-List
tp://forums.matronics.com
_blank">http://www.matronics.com/contribution
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[b]
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Dawg
Joined: 19 May 2013
Posts: 355
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| Posted: Sat May 31, 2014 4:55 am Post subject: Uneven fuel tank flow |
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Do you step on the full tank?
On May 31, 2014, at 6:28, "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net (dsavarese0812(at)bellsouth.net)> wrote:
[quote] The problem is most likely the vent system caused by when you fill the tanks and fuel getting into the vent line. OR by fuel expansion due to the heating. Just a poor design on the pre-'89 model Yak 52's. Usually the right vent line fills with fuel and causes the right tank not to feed properly. You can "step on the full tank" and fly level, holding that position for a minute or two and usually the fuel in the vent line will work its way out and the tank will begin feeding.
As Bill said, use the rudder.
Dennis
| Quote: | A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1 |
On 5/31/2014 7:17 AM, Bill Scruggs wrote:
| Quote: | <![endif]--> <![endif]-->
My Yak 52 fuel tanks will not drain from both evenly. It’s not a small difference, last flight 50 L on one side, 20 L on the other by end of a 1.1 hr flight. Any thoughts on how to remedy this situation?
Bill
===================================
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cs.com
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matronics.com/contribution
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[b]
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Viperdoc
Joined: 19 Apr 2014
Posts: 484
Location: 08A
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| Posted: Sat May 31, 2014 4:56 am Post subject: Uneven fuel tank flow |
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Bill,
Rudder and adverse yaw will help right tank imbalance from flying with the ball not centered. The problem is most likely the vent line from the right tank is blocked by fuel that has essentially vapor locked in the line. That happened with over filling the right tank or by not venting the tank when sitting in hot weather by not cracking the fuel cap.
It has to do with the older YAK 52 vent line design taking both tank vent lines to a single overflow line exit on the belly. Fuel gets caught in the siphon from the right tank under your left check in the cockpit
The fix is to take a rubber hose/ PCV (flexible) about 1/4 to 3/8's dia. Hook it too the vent line on the center of the fuselage pretty much right under the front cockpit and blow air through it until you hear air bubbling in the tanks with the caps off the tank of course.
Dennis taught me that trick.
Now if you fly with auto gas there maybe some corrosion of the right tank reverse flow flapper valve. A bit more rare of a problem though.
VD
Sent from my iPad
On May 31, 2014, at 7:24 AM, Bill Geipel <l129bs(at)gmail.com (l129bs(at)gmail.com)> wrote:
| Quote: | Rudder.
On May 31, 2014, at 6:17, "Bill Scruggs" <bscruggs(at)charter.net (bscruggs(at)charter.net)> wrote:
| Quote: | <![endif]--> <![endif]-->
My Yak 52 fuel tanks will not drain from both evenly. It’s not a small difference, last flight 50 L on one side, 20 L on the other by end of a 1.1 hr flight. Any thoughts on how to remedy this situation?
Bill
D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
ist"">http://www.matronics.com/Navigator?Yak-List
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ot;">http://www.matronics.com/contribution
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Viperdoc
Joined: 19 Apr 2014
Posts: 484
Location: 08A
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| Posted: Sat May 31, 2014 5:07 am Post subject: Uneven fuel tank flow |
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Yes with adverse yaw. Snap rolls to the left then the right also works. Usually I raise the right wing with right rudder and left stick to drop the left wing. If stubborn I go the other (opposite) direction with adverse Yaw as well as while in adverse yaw shake the right up wing by rocking the stick left to right somewhat aggressively may help break the vapor lock. If it still is not flowing I'll do the snap rolls.
If that did not solve it blow air through the vent line. On the ground of course.
VD
Sent from my iPad
On May 31, 2014, at 7:54 AM, Bill Geipel <l129bs(at)gmail.com (l129bs(at)gmail.com)> wrote:
| Quote: | Do you step on the full tank?
On May 31, 2014, at 6:28, "A. Dennis Savarese" <dsavarese0812(at)bellsouth.net (dsavarese0812(at)bellsouth.net)> wrote:
| Quote: | The problem is most likely the vent system caused by when you fill the tanks and fuel getting into the vent line. OR by fuel expansion due to the heating. Just a poor design on the pre-'89 model Yak 52's. Usually the right vent line fills with fuel and causes the right tank not to feed properly. You can "step on the full tank" and fly level, holding that position for a minute or two and usually the fuel in the vent line will work its way out and the tank will begin feeding.
As Bill said, use the rudder.
Dennis
| Quote: | A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1 |
On 5/31/2014 7:17 AM, Bill Scruggs wrote:
| Quote: | <![endif]--> <![endif]-->
My Yak 52 fuel tanks will not drain from both evenly. It’s not a small difference, last flight 50 L on one side, 20 L on the other by end of a 1.1 hr flight. Any thoughts on how to remedy this situation?
Bill
===================================
//www.matronics.com/Navigator?Yak-List
===================================
cs.com
===================================
matronics.com/contribution
===================================
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ist"">http://www.matronics.com/Navigator?Yak-List
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jblake207(at)comcast.net
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dsavarese0812(at)bellsout
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| Posted: Sat May 31, 2014 8:13 am Post subject: Uneven fuel tank flow |
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Bill,
If you install one of these ball-check valves in the fuel cap, you will very likely eliminate the fuel venting problem. We now recommend installing these ball-check valves when installing the fuel bladders in a 52. They would be installed in the bladder filler plate. But the easiest way to do it with the original metal tanks is to install this ball-check valve in each fuel cap.
http://www.fuelsafe.com/store/vent-check-valves/1flu101.html
Installing it will provide a second vent line to the orginal tanks.
Dennis
| Quote: | A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1 |
On 5/31/2014 7:28 AM, A. Dennis Savarese wrote:
[quote] The problem is most likely the vent system caused by when you fill the tanks and fuel getting into the vent line. OR by fuel expansion due to the heating. Just a poor design on the pre-'89 model Yak 52's. Usually the right vent line fills with fuel and causes the right tank not to feed properly. You can "step on the full tank" and fly level, holding that position for a minute or two and usually the fuel in the vent line will work its way out and the tank will begin feeding.
As Bill said, use the rudder.
Dennis
| Quote: | A. Dennis Savarese
334-285-6263
334-546-8182 (mobile)
www.yak-52.com
Skype - Yakguy1 |
On 5/31/2014 7:17 AM, Bill Scruggs wrote:
| Quote: | <![endif]--> <![endif]-->
My Yak 52 fuel tanks will not drain from both evenly. It’s not a small difference, last flight 50 L on one side, 20 L on the other by end of a 1.1 hr flight. Any thoughts on how to remedy this situation?
Bill
|
[b]
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Viperdoc
Joined: 19 Apr 2014
Posts: 484
Location: 08A
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| Posted: Sat May 31, 2014 3:45 pm Post subject: Uneven fuel tank flow |
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Or a YAK 50!
VD
Sent from my iPad
On May 31, 2014, at 8:27 AM, Jon Blake <jblake207(at)comcast.net (jblake207(at)comcast.net)> wrote:
| Quote: | Buy a CJ... 
Sent from my Verizon Wireless 4G LTE DROID
Bill Scruggs <bscruggs(at)charter.net (bscruggs(at)charter.net)> wrote:
My Yak 52 fuel tanks will not drain from both evenly. It’s not a small difference, last flight 50 L on one side, 20 L on the other by end of a 1.1 hr flight. Any thoughts on how to remedy this situation?
Bill
| Quote: |
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//www.matronics.com/Navigator?Yak-List
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cs.com
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Dale
Joined: 30 May 2007
Posts: 178
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| Posted: Sat May 31, 2014 5:00 pm Post subject: Re: Uneven fuel tank flow |
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Flying around in a left hand pattern all day or left circling or wing low will cause it every time. Try flying right turns everywhere you go and see what happens. Left hand turn flying is easy not to notice. Even if tanks are off after a while one side will stop and then the other side will start draining. It will get your attention until the high side starts draining. Nothing may need to be "fixed at all"
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