REFLECTOR: Fuel System -- Return Fuel Flow

[Scott Derrick]

Continental engines can return quite a bit of fuel. At least the 520's 
can.  The T210's have a known problem of overheating their sump tanks 
with fuel return and there is a AD out to address that with the electric 
aux pump.  The 210 has a system very much like ours but with a little 
bitty sump, I think its 1/2 gallon.

Since my sump is 3+ gallons I'm not concerned.  I draw from 4 inches 
from the bottom of the sump and return to the top of the sump.  No 
problem in 100 hours, some of those in 100+ F oat.

Scott

-------- Original Message --------
Subject: REFLECTOR: Fuel System -- Return Fuel Flow
From: Brian Michalk <michalk at awpi.com>
To: Velocity Aircraft Owners and Builders list <reflector at tvbf.org>
Date: 12/08/2011 08:32 AM

> In my arrangement, I an using electronic fuel injection, with my fuel
> rail running at 45PSI. I have a Bosch electric pump delivering what I
> think is .7 gpm (I need to verify this), and a mechanical positive
> displacement pump delivering 1.7gpm.
>
> My fuel pressure regulator returns the fuel to the sump tank, which is
> also where the feed line is for the fuel pumps, so the fuel circuit is
> sump->pumps->FPR->sump. Since I'm fixed gear, my sump is a little less
> than five gallons.
>
> My question is, what are other people doing for their fuel return
> configuration that are using actual regulators. The vapor return system
> on some of the aviation pumps returns very little fuel, I believe, so
> it's not the same thing.
>
> Is a five gallon sump big enough? Will it fill up with foamy fuel
> vapors? This is avgas, not automotive fuel.
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Sin makes its own hell, and goodness its own heaven.
Mary Baker Eddy