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Date: Wed, 17 Nov 2004 15:25:37 -0600
From: Charlie England <ceengland@bellsouth.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: External Fuel Pump ...
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Various RV-x drivers that use the O-320-H-series engine have deleted the 
front mounted mech. pump & gone to 2 elec. pumps (low pressure 
carburated systems).

Charlie

Tracy Crook wrote:

> The engine driven fuel pump (bolted to a hot air cooled engine) with a 
> gascolator mounted down where the hottest air exits and near red hot 
> exhaust pipes (standard aircraft practice) is the dumbest fuel system 
> layout I can think of.  And they wonder why they are so prone to vapor 
> lock........
>  
> Two electrics sound like a fine idea to me.
>  
> Tracy
>
>     ----- Original Message -----
>     From: Jim Sower <mailto:canarder@frontiernet.net>
>     To: Rotary motors in aircraft <mailto:flyrotary@lancaironline.net>
>     Sent: Wednesday, November 17, 2004 12:13 PM
>     Subject: [FlyRotary] External Fuel Pump ...
>
>     All,
>     I'm back.  Been away too long.  Lots of catching up to do.
>
>     The problem:
>     My  )&$^^$#  Lyc IO-360 went south again.  Blew a head.  Fixed it for
>     something over $2k.  Still have a power loss (down to about 60%)
>     about
>     5-7 min into every flight.  After extensive trouble shooting
>     (checking
>     everything but fuel pressure which I don't have /yet/) I'm pretty
>     sure
>     it's fuel [delivery] related.  My 26 psi electric boost pump costs
>     $600
>     at Spruce.  The Engine driven pump is $225.  I believe they're
>     both bad.
>
>     I need:
>     An automotive replacement for the electric boost pump.  John Slade
>     said
>     IIRC that his pumps set him back about $85 each.  I would need to
>     plumb
>     a return to the sump tank (or back into the inlet) side of the pump)
>     through a pressure regulator that I could set at 25-27 psi.
>
>     Does anyone know of a fuel injection rail regulator (or anything
>     at all
>     that can be plumbed into an AN-6 system) that can be adjusted down to
>     regulate at 26 psi?
>
>     Do automotive high pressure fuel pumps allow fuel to pass freely
>     if they
>     are turned off?  Like, could one plumb two of them in series and use
>     them one at a time (as that's what would have to be the case if I
>     were
>     to retain the engine driven pump)?  If so, what might be the pressure
>     drop across the idle boost pump when the engine driven pump is
>     carrying
>     the load and the boost pump is off?
>
>     What are anyone's thoughts around dispensing with the engine
>     driven pump
>     and using two electric pumps in parallel?  This idea just popped
>     into my
>     head as I was writing this, so it's still in the "brain fart" stage.
>
>     Thanks in advance for any and all ideas ... Jim S.
>
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>