From: "Russell Duffy" <13brv3@bellsouth.net>
Date: 2005/05/30 Mon PM 03:53:14 EDT
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: will EFI pumps pump air

  You *have* replicated my system because I also "T" the transfer pump into
the EFI return line to feed tank.   It has no problem transferring fuel with
this arrangement.  Facet makes these pumps in several different pressure
ranges.  I think mine is the 4-6 psi model.   I used 3/8" line in this
portion of system.  Did you use something smaller?  Hi Tracy,
 
That's interesting, because I didn't recall that you Teed yours also.  One
difference I know we've discussed is the fact that you were smart enough to
run your return line to the top outboard end of the tank, so it wouldn't be
submerged.  Mine is just a fitting on the removable cover where the fuel
level sender is.  That causes me some problems with the fuel wanting to seek
a common level between tanks when it's more than about half full, but I
doubt it's the return problem.   I believe my pump is a 4-6 psi version, but I'd have to look to be sure.
The whole fuel system is AN-6 (3/8") line, with the exception of the tank
vents, which are AN-4 I believe.   I also connect my transfer pump near the top of the fuselage, so the facet
has to push the fuel a couple feet uphill, to where it meets the return
line.  Perhaps that, and the one way check valve I just installed are just
too much for it.  What I need is a pump the same size as what I have, but in
about 10-15 psi.  Seems like I looked, but couldn't find any such animal.   Thanks,
Rusty (off to remove the VW engine from the Sonerai... long story, but I
still have two unflyable planes)