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Facet pump and vapor lock.

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airvair601(at)yahoo.com
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Posted: Wed Apr 08, 2009 4:52 am Post subject: Facet pump and vapor lock.

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Facet pump and vapor lock.  

   

It would seem the most cited way to plumb a covair driven wing tank

 only 601 is with 2 in series facet fuel pumps on the firewall.



  Logic would suggest this instillation (sucking vs pumping fuel)

 is susceptible to vapor lock.  My question is: has anyone 



experienced vapor lock with a facet pump? If so, what was the

 instillation and flying conditions.  There are lots of plumbing and

 weight advantages to this instillation (pump redundancy, oil

 pressure driven fuel shut off, reduced weight, access to all the 



fuel all the time). Thanks for your in put.  Phill Hartig



  

         [quote][b]

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ashleyw(at)gvtc.com
Guest

Posted: Wed Apr 08, 2009 5:18 am Post subject: Facet pump and vapor lock.

My 601XL has an 0-200 with no mechanical  pump.  I use the two facet solution on the firewall and have not had a  problem.  Worked great last summer when outside temps were near  100.

  

 Floyd Wilkes

 [quote]   ---

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larry(at)macsmachine.com
Guest

Posted: Wed Apr 08, 2009 6:22 am Post subject: Facet pump and vapor lock.

Phill,

I've got two facet pumps in parallel on my firewall and they work well 

independently or together.

The advantage of this is one pump cannot get clogged and shut down the 

other. I normally take off with two and

run on one. If the one leading in serial order quits, do you increase 

the odds of vapor lock? It would seem so.

130 hours and running.



Larry McFarland 601HDS

601corvair wrote:

 	  Quote: 	
		  

 Facet pump and vapor lock.



  



 It would seem the most cited way to plumb a covair driven wing tank



 only 601 is with 2 in series facet fuel pumps on the firewall.



   Logic would suggest this instillation (sucking vs pumping fuel)



 is susceptible to vapor lock.  My question is: has anyone



 experienced vapor lock with a facet pump? If so, what was the



 instillation and flying conditions.  There are lots of plumbing and



 weight advantages to this instillation (pump redundancy, oil



 pressure driven fuel shut off, reduced weight, access to all the



 fuel all the time). Thanks for your in put.  Phill Hartig

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daveaustin2(at)primus.ca
Guest

Posted: Wed Apr 08, 2009 7:07 am Post subject: Facet pump and vapor lock.

Won't two pumps in series give you double the  pressure?  That would not work for a bing carb engine.

 Dave Austin  601HDS -  912

    [quote][b]

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davgray(at)sbcglobal.net
Guest

Posted: Thu Apr 09, 2009 2:21 am Post subject: Facet pump and vapor lock.

During testing I recorded 9 lbs psi on the ground when both facet pumps were

on at the same time.  The Ellison was not running well in this condition.  I

rewired the switches so either pump but not both could be active at the same

time.  I now have a Marvel Schebler MA3-SPA but I did not repeat the test.



Gary Ray

davgray(at)sbcglobal.net



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