Mailing List flyrotary@lancaironline.net Message #22738
From: Jim Sower <canarder@frontiernet.net>
Subject: Re: [FlyRotary] Re: will EFI pumps pump air was Re: Fuel Tank Selection
Date: Mon, 30 May 2005 00:20:42 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>


Russell Duffy wrote:
Message

   Now I'm not so worried, because each high pressure fuel
pump draws from it's own tank and the only point of inter- connection is where the lines join at the fuel rail(s).

 
This brings up a question that I've had before, and I'm not sure this is exactly what anyone is doing, so it's not meant that way.
 
Say you have two tanks, with an EFI pump for each tank.   You then connect the output of each pump together, feeding into one line running to the fuel rail.   The question is:  What happens when one tank runs out of gas?  Will the EFI pump move enough air through it to disturb the fuel rail pressure that's being delivered from the other pump, I would say yes or would it just stop pumping at that point, and do no harm (other than maybe burning the pump up eventually)? 
 
Yep, still trying to figure out how to fix my fuel transfer system.  What's it look like now?
 
Cheers,
Rusty
 
 
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