Yes, I have 2 fuel pumps; but only one is electric (I think). The
original fuel
pump is engine driven as I understand it. The second fuel pump is for
use
only if the engine driven pump fails. I can't use it in flight
without transferring
too much fuel to the left tank. I have the 2 9 gal wing tanks on a
415C with
a c-90 engine. I don't know why the previous owner installed the back up
fuel pump; but nice to know I can transfer the fuel from wing tanks
to header
if the engine driven pump fails.
Dan Caliendo
Ercoupe Mach 0.14
3658H
On Feb 17, 2009, at 1:43 PM, John Cooper wrote:
>> Does anyone have an Ercoupe with 2 electric fuel pumps installed?
I'm not sure what the point would be.
The standard Ercoupe fuel system uses the engine driven pump to
transfer
fuel from the wing tanks to the header tank. Fuel feed to the
engine is by
gravity feed. No fuel pump is required. Since the engine driven
pump is
being used as a transfer pump, no backup pump is required.
The O200 engine generally is not configured for an engine driven
pump. The
vast majority of O200 engines are installed in high wing planes and
gravity
fed, so the parts to drive an engine driven fuel pump are extremely
rare and
expensive. For this reason, the O200 STC allows the use of an electric
transfer pump, but, again, since it is not feeding the engine, no
backup
pump is required.
There is another STC to remove the header tank and install 2 15
gallon wing
tanks instead. This STC requires the engine driven pump to feed
fuel from
the wing tanks to the carburetor, and, because it's feeding the
carburetor,
a backup pump is required. The backup pump is electric.
Now, consider the combination of an O200 and the 15 gallon wing tanks.
Since the O200 engine driven pump is a scarce and expensive option,
could we
instead use 2 electric pumps? Well, the answer is "no". The backup
pump
cannot be powered by the same electrical system as the main pump,
so, baring
dual alternators and batteries, this is not an option.
So, I cannot think of a configuration where dual electric pumps
would be
called for.
John Cooper
Skyport Services
www.skyportservices.net
-----Original Message-----
From: [email protected] [mailto:ercoupe-
[email protected]] On
Behalf Of veropilot
Sent: Tuesday, February 17, 2009 9:46 AM
To: [email protected]
Subject: [ercoupe-tech] Ercoupe with 2 Electric Fuel Pumps on O200
Engine
Does anyone have an Ercoupe with 2 electric fuel pumps installed?
I recently saw a Coupe with 2 electric fuel pumps and no mechanical
engine driven fuel pump on an O200 engine.
The Skyport O200 STC calls for just one electric fuel pump, if I
recall
correctly.
Look forward to hearing from anyone who is familiar with this type of
system.
Jose Gibert
Vero Beach
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