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joeb47(at)verizon.net
Guest

Posted: Fri Feb 24, 2006 9:49 am Post subject: Zenith-List:

Dear George,



But MOST IMPORTANT of ALL!  The Facet pump should be physically LOW.

You really want the pump intake to have a good supply of fuel at all 

angles of attack!

The Facet pumps are pretty good, solid pumps.  They are TERRIBLE air pumps!

They do NOT do a good job of sucking air, so you always want the input 

to the

pump to be flooded!



Lastly, Facet recommends that the fuel filter should be BEFORE the pump 

inlet so

that you don't get junk into the pump that could impede the motion of 

the plunger.



Best,

Joe Bienkowski, Bowling Green, OH



george.mueller(at)aurora.org wrote:



 	  Quote: 	
		  



Thanks to the list for all of the good comments about aux fuel pumps in the

701 fuel system  One thing that caused some confusion is that I left out

the decimal points in the specs for the facet 40105 pump, which puts out

25 to 45PSI (thats 2point5 to 4point5 PSI)



>From the listers comments, it sounds like a 40105 in series with the rotax

mechanical pump will not impede the fuel flow when the facet pump is off

So the system really would not know the facet pump is there when it was

off  Also  it sounds like it would be better to have the in line fuel

filter downstream of the facet pump rather than upstream



A couple of other things I am wondering about  One lister suggested that

the facet pump should be installed upstream of the gascolator and the fuel

filter  Is this how most have done it?  This route would, I assume, have a

T connection from the wing tank lines, then the facet pump, then the

gascolator, then the inline fuel filter, then on to the mechanical pump on

the rotax  Also, for those with an aux electric pump, does this help the

problem of uneven tank drainage that some have reported with the 701?

Would running an aux electric pump pull fuel from both tanks more evenly?

I am also wondering about the fact that there is no fuel filter screen in

the ZAC gascolator  If you have an inline fuel filter downstream from the

gascolator would a screen in the gascolator just be overkill?  Or is it

worth upgrading to a gascolator with a filter screen?

George

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frank.hinde(at)hp.com
Guest

Posted: Fri Feb 24, 2006 10:33 am Post subject: Zenith-List:

It is debabtable where the filter should be...If you plug the filter you

will suck hard on the fuel and vapour lock the pump....Other experience

have shown the facets to be pretty dirt tolerant.



These points woud argue to putting it after the pump, i.e NO

restrictions prior to the pump. Of course you will have a filter for

each pump if you have two parallel.



High pressure FI pumps are definatly NOT dirt tolerant, so for my RV7 I

reluctantly have a filter before each pump.



But Joe is right flooded suction is the most important of all...When it

specifies "Lift" in the catalogue put this value to zero...Its just too

risky.



In my 601 the Facet pumps are in the wing roots.



Frank



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