The Murphy Builders Site

Good evening to all from Alaska,

I am looking for opinions and suggestions
regarding adding an electric fuel pump in line
with the mechanical fuel pump on my Lycoming O-
540-A4A5 on a Super Rebel. I ran some fuel flow
tests the other day on my SR and with the tail on
the ground and 10 gallons in each tank I am
seeing a fuel flow of about 25 gallons per hour
(gph) downstream of the gascolator and before the
mechanical fuel pump. From what I have read I
should be getting 150% of the maximum consumption
of the engine which would be 24 gph x 150% or 36
gph.

I am wondering if the necessary fix is to add an
electric boost pump after to gascolator so that I
am ensured ample fuel flow or if the mechanical
fuel pump on the engine will be sufficient
to 'suck' adequate flow to the carburetor.

Any opionions or past experiences would be
appreciated.

We have done some taxi tests with our SR and all
is going great. We will get it flying after we
resolve some brake issues and this fuel flow
question. Also got to fly with Robin in the 3500
when it was up here. That machine is incredible.


Chris Gill



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Chris,
I added an electric boost pump ahead of the gascolator, I'm using the IO540.
I don't think it matters where you put the pump, as long as it's ahead of
the mechanical pump. The fuel test that I ran was a preliminary test to
prove out the system. Using the lines and only the boost pump it would pump
about 48gal/hr. I have 3/8 fuel lines, next time I'll go for 1/2" lines and
less pressure.
Al Paxhia
----- Original Message -----
From: <cgill@dcsol.com>
To: <murphy-rebel@dcsol.com>
Sent: Wednesday, June 06, 2001 11:24 PM
Subject: Electric Fuel Pump on SR2500


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Good evening to all from Alaska,

I am looking for opinions and suggestions
regarding adding an electric fuel pump in line
with the mechanical fuel pump on my Lycoming O-
540-A4A5 on a Super Rebel. I ran some fuel flow
tests the other day on my SR and with the tail on
the ground and 10 gallons in each tank I am
seeing a fuel flow of about 25 gallons per hour
(gph) downstream of the gascolator and before the
mechanical fuel pump. From what I have read I
should be getting 150% of the maximum consumption
of the engine which would be 24 gph x 150% or 36
gph.

I am wondering if the necessary fix is to add an
electric boost pump after to gascolator so that I
am ensured ample fuel flow or if the mechanical
fuel pump on the engine will be sufficient
to 'suck' adequate flow to the carburetor.

Any opionions or past experiences would be
appreciated.

We have done some taxi tests with our SR and all
is going great. We will get it flying after we
resolve some brake issues and this fuel flow
question. Also got to fly with Robin in the 3500
when it was up here. That machine is incredible.


Chris Gill

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