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Date: Thu, 16 Oct 2003 07:21:42 -0400
To: <flyrotary@lancaironline.net>
From: Joseph Berki <joseph.berki@grc.nasa.gov>
Subject: Fwd: Fuel systems
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>
>Hi,
>         I know that this has been discussed before but I still have not 
> found a good solution. The Limo EZ (same as Long EZ) has two tanks mid 
> wing design.  Original design requires fuel from both tanks to be fed to 
> a valve and then back to the engine.  Problem, fuel injection requires 
> special valve to return fuel to tank it was delivered from.   This means 
> 3 more lines in addition to the 3 lines already in the cockpit.  I think 
> this is getting complicated.  I like the sump idea creating one tank but 
> the problem is return.  If you return it to the sump you heat the fuel in 
> the sump up.  Is there any way to divide the fuel return so it can be 
> returned to both tanks?  If you tee the return lines does the fuel divide 
> evenly?  I thought about another sump to return the fuel to and let it 
> drain into both tanks.  Make it higher than the delivery sump. I am 
> trying to avoid a transfer pump but it would need two lines instead of 3 
> and they could be placed outside the cockpit.  What about using two pumps 
> that can be synchronized?  One could pump fuel from the right tank to the 
> fuel rail and the other could transfer fuel from the left tank to the 
> right tank depending on the fuel flow being pumped from the right 
> tank?  Return fuel would go the the left tank making a continuous loop 
> allowing the fuel to cool? I keep thinking of my friends Bellanca with 5 
> fuel tanks a fuel management nightmare.  Thanks for any help.
>
>Joe Berki
>Limo EZ