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 -----
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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