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Fuel Both Selector

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Speedy11(at)aol.com
Guest

Posted: Thu Jun 10, 2010 6:10 pm Post subject: Fuel Both Selector

Terry,

 I've had no airborne problems using a both position on my RV-8A.  The  tanks feed evenly.  I occasionally feed slightly more from the right tank  than the left and I believe that is due to flying with the ball out of  center.  I'm going to do skidding flight tests to verify that  theory.

 On the ground, if the selector is left in both, the tanks will feed from  fullest tank to emptiest until they are equal.

 When building, the cost of the fuel selector was the same with or without  both position.  I decided I could always fall back to using Left-Right if  the both selection did not work well.  It does work well.

 Regards,

 Stan Sutterfield

  	  Quote: 	
		  Isn't    there a cross-feed problem with a 'both' fuel selector on a low wing

plane    like an RV? Did you find a way to deal with  that?

Terry

	


 

  

  [quote][b]

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altoq(at)cebridge.net
Guest

Posted: Thu Jun 10, 2010 6:46 pm Post subject: Fuel Both Selector

If a tank runs low enough that it will suck air,  that’s what you get, air. No matter how much fuel is in the other tank( s  ), unless gravity is helpin' out.

 John D

  

 DO NOT ARCHIVE

  

  



   

    [quote][b]

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Speedy11(at)aol.com
Guest

Posted: Fri Jun 11, 2010 4:39 pm Post subject: Fuel Both Selector

John,

 What happens (ops tested) is when the both position is selected  and one tank runs dry, air is drawn into the line and since air is easier to  pump than fuel, the engine will falter.  Selecting the tank with fuel  remaining restores power immediately.

 Gravity feed does not matter since the electric pump is creating  suction and you are switching from the both position to one  tank.  Then one is feeding fuel just as any RV that does not have a both  position, that is, selecting left or right tank.  It is the  same as if one ran one tank dry and switched to the other.

 I've ops checked it.

 Stan Sutterfield

   	  Quote: 	
		  If a    tank runs low enough that it will suck air, that's what you get, 

air. No    matter how much fuel is in the other tank( s ), unless gravity 

is helpin'    out.

John D

	


  [quote][b]

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