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As I understand (anyone
correct me if I am wrong), the only Ercoupes flying with an electric fuel pump
have either received a field approval for it (I don't know anyone yet who has
one this way) or got it as part of the O-200 installation STC (which is how I
have mine). The light is to let you know when the pump is no longer
pumping fuel to the header tank. 99% of the time, this should be because
you are out of fuel in the wing tanks. The other 1% could be a failure of
the pump. The light is activated by a pressure switch on the fuel line
from the pump.
Per your
questions:
1) No. The electric
fuel pump replaces the mechanical fuel pump.
2) The electrical fuel
pump is on while you have fuel in the wing tanks. The light glows when the
wing tanks are empty. You then turn off the electric fuel pump at this
time to help prevent it from overheating and/or wearing out by
dry-pumping.
3) The electrical fuel
pump is just a transfer pump. It transfers more fuel into the header tank
than you burn (the same as the mechanical pump did) and the excess is routed
back into the wing tanks via overflow tubes from the header to one (or both per
the STC I believe) wing tanks.
4) The drawings I have
show where to install it (on the firewall - engine side). But the STC
requires you to change the model from "C" to "D" before installation.
Again, a field approval would get you around that.
5) See #4.
6) I show that my "T"
between the wing tanks was moved to the center (between the
wings)... Prior, it was closer to the right wing. Also, the
overflow from the header was changed to now go back into both wing tanks...
Prior it just went to one. And finally the wing tanks now use unvented
caps... Prior, they were vented. I don't remember what else was
changed. These were all done during the '70's and not by me. They
MAY or MAY NOT be related to the STC for the engine installation and have
nothing to do with the pump.
I would also let you know
that Paul Anton out in Washington state is looking at getting field approval for
an electrical fuel pump to be installed on a plane out there. I'm not sure
it is an Ercoupe or not, but perhaps he can help shed light.
------------------------------------------------------------ Jason J Ellingson NC2273H From: Ron Hynes [mailto:[EMAIL PROTECTED] Sent: Sunday, December 25, 2005 6:09 PM To: [email protected] Subject: [COUPERS-FLYIN] Electric Fuel pumps.
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