Matronics Email Lists :: View topic

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Uneven Fuel Feed

Matronics Email Lists Forum Index -> Yak-List

View previous topic :: View next topic

Author Message

Scooter

Joined: 10 Jan 2006
Posts: 155

Posted: Tue Aug 29, 2006 8:42 am Post subject: Uneven Fuel Feed

I'm about to tackle the mysterious Yak-52 fuel feed problem.  Figured I'd first remove the caps and drain five or ten gallons to see if it was a blocked vent problem.  Then, if still a problem, I'd check the lines and one-way valve.  Are the fuel lines and valve easily accessable?  I think there are inspection panels on either side of the sump drain.  Will these give me access to the one-way valves and fuel lines?  I've read in the archives about dimpling the flap in the valve.  Any other advice would be appreciated.

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

dsavarese(at)elmore.rr.co
Guest

Posted: Tue Aug 29, 2006 3:02 pm Post subject: Uneven Fuel Feed

Scooter,

The uneven fuel feed is perfectly normal in the 52.  Most feed from the left 

tank first down to about 40-45 liters and then the right starts to come 

down.  First try flying the airplane with your feet off the rudder pedals 

and see if the airplane is yawing left or right.  First correct the yaw 

problem before you go digging into any fuel feed problem.  BTW, the 

inspection panels under the wing root panels will not give you access to the 

fuel valves.  They are under the front seat in the junction where the fuel 

lines from the left and right tanks come together.  The fuel lines coming 

into this junction connect directly to the main fuel tanks.  You'll have to 

remove the lower wing panels to get to these fittings.



You can easily check the vent lines by removing the fuel cap on one tank and 

blowing hard into the fuel vent line under the fuselage or you can use 

regular shop air.  Have someone listen at the tank opening.  They should 

hear the air bubbling through the tank.  Repeat the procedure for the other 

tank.



As I said earlier, unequal fuel feeding is very common and it is because we 

tend to use a lot of left rudder.  So please don't overreact to the unequal 

fuel feed.  Now if it goes down to 20 liters on one side before the other 

side starts to feed, you may want to inspect the valves at the junction 

under the seat.



Hope this helps.

Dennis



---

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

cpayne(at)joimail.com
Guest

Posted: Tue Aug 29, 2006 3:58 pm Post subject: Uneven Fuel Feed

Scooter,

  

 I would agree with what Dennis said but add that it is worthwhile to level the airplane side-to-side on the jacks with a level across the canopy rails. Once that is done, tweek the adjustable ball levels on the T&B and AH. Helps to know whether the error is out-of-rig or just misadjusted guages. I admit to finding skid/slip balls out of whack on my airplane, causing me to hold some rudder. Happens often after periods of acro.

  

  

 Craig Payne

 cpayne(at)joimail.com (cpayne(at)joimail.com)

  

  

 

  [quote][b]

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

dsavarese(at)elmore.rr.co
Guest

Posted: Tue Aug 29, 2006 4:39 pm Post subject: Uneven Fuel Feed

Good point Craig.

 Dennis

  

 [quote]   ---

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

Scooter

Joined: 10 Jan 2006
Posts: 155

Posted: Thu Aug 31, 2006 9:09 am Post subject: Re: Uneven Fuel Feed

Thanks Dennis (and Craig).  Once again, invaluable info.



 	  dsavarese(at)elmore.rr.co wrote: 	
		  Scooter,

The uneven fuel feed is perfectly normal in the 52.  Most feed from the left 

tank first down to about 40-45 liters and then the right starts to come 

---

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

viperdoc(at)mindspring.co
Guest

Posted: Thu Aug 31, 2006 9:46 am Post subject: Uneven Fuel Feed

Scooter,

If the uneven fuel feed does not correct itself after on approaching the 40

liter mark on the left tank, then to break the vapor lock in the right tank

you skid the aircraft with right top rudder and left aeliron for a few

minutes. That is assuming it did not fix itself after centering up the

ball. You may have to skid the plane a few times to get it to feed. I have

also rolled the aircraft to get it feeding also. Generally into the

offending tank. If I really having a good time, I'll roll it the other way

also. The skidding and rolling generally gets the right tank feeding along

with me breaking the monotony of flying straight and level droning along in

formation on that cross country. 

Doc Kemp

 	  Quote: 	
		   [Original Message]

 From: Scooter <yakk52(at)verizon.net>

 To: <yak-list(at)matronics.com>

 Date: 8/31/2006 12:27:33 PM

 Subject: Re: Uneven Fuel Feed

 Thanks Dennis (and Craig).  Once again, invaluable info.

 dsavarese(at)elmore.rr.co wrote:

 > Scooter,

 > The uneven fuel feed is perfectly normal in the 52.  Most feed from the

left 

 	  Quote: 	
		   > tank first down to about 40-45 liters and then the right starts to come 

 > ---

 Read this topic online here:

 http://forums.matronics.com/viewtopic.php?p=58748#58748

- The Matronics Yak-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Yak-List

Display posts from previous:

	Matronics Email Lists Forum Index -> Yak-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum