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Date: Fri, 18 Feb 2005 08:12:01 -0700
From: Bob White <bob@bob-white.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Return Fuel Line Sizes Clarification
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Thanks again Leon.

That's a good point about the EFI pump outlet size.  I bought my pumps 
from Tracy and they have 5/16 inch hose barbs on the inlet and outlet.  
The outlet is threaded 3/8-24 so I ordered two AN-3 to AN-6 adapters 
(two pumps).  Back in January Jim Sower reported finding them at XRP.  
The AN-3 side only has a 1/8 inch hole, but since I'm using an 'O'-ring 
to seal, not the cone, I can drill them out to at least the ID of the 
5/16 inch hose barb.  If that's more than 1/4 inch, I will just drill 
them at 1/4 inch.  It looks like I'm in good shape to just use a 
standard EFI setup. 

Bob White

On Fri, 18 Feb 2005 20:24:10 +1100 "Leon" 
<peon@pacific.net.au> wrote:

> Hi Bob,
> 
> Thanks for the comments.  Upon re-reading what I wrote,  I do need to
> clarify what I wrote last post.  I should have been a little more succinct
> in my statements,  as it sort of conveys a meaning slightly different to
> that which I had intended.
> 
<snip>
> The reason for this is that when you look at the OUTLET of most factory EFI
> high pressure pumps,  the INSIDE diameter of outlet nipple on the pump is
> quite tiny,  which is why I usually can get away with using 1/4" return
> lines.  The ID of the pump output nipple is the thing that limits the flow
> capacity of the whole system.
> 

> Cheers,
> 
> Leon
> 
> 

><snip> 
> >

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