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Fwd: Fuel pump puzzle

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mtherr(at)yahoo.com
Guest

Posted: Mon Jul 03, 2006 8:55 am Post subject: Fwd: Fuel pump puzzle

Test test test... no response yet... 



Anybody here using Facet pumps?

 	  Quote: 	
		   

 Good morning!

 

 I recently discovered that my fuel pumps are less

 efficient in flight.  Fuel pressure (which is

 measured

 at the gascolator) gets down to ONE psi.

 

 I have one pump at each wing tank (Fred, I'm not

 sucking fuel   I also have a third pump at the

 firewall.

 

 Performance is the same with both the left and right

 pumps.  I feel the pressure is a tad higher when

 using

 the firewall pump.

 

 I did a test on the ground.  Fuel flow is exactly

 the

 same from the 3 pumps and is same as new pumps (25

 gal/hr).  Fuel pressure on the ground is normal (5

 psi

 per pump approx).  

 

 Anybody would know why I don't get the usual 3-5 psi

 in flight? (now it is more like 1 to 3)

 

 Yesterday, as a workaround, I used the firewall pump

 in conjunction with the wing pumps (firewall pump is

 in series) and I got 4-6 psi.

 

 Michel

 PS: the pumps I use are the Facet 40108 pumps.  The

 wing pumps have approx 200 hours of use each. 

 Firewall pump is much less solicitated.


	




----------------------------

Michel Therrien CH601-HD, C-GZGQ

  http://mthobby.pcperfect.com/ch601

  http://www.zenithair.com/bldrlist/profiles/mthobby

  http://pages.infinit.net/mthobby



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