Gary,
The Bendix injection system for smaller Lycomings requires that the
throttle body have a minimum fuel pressure to operate through the spider
properly. It doesn't care how the minimum pressure is maintained.
Typically, the engine driven provides pressure in excess of the minimum and that
help reduce inline vaporization. Typically, an electric pump is also
designed to deliver this excess pressure fuel. In these systems, pressure
regulation occurs at the pump. In Other systems, pressure may be regulated
by regulation at the throttle body by sending excess fuel back to the tank from
whence it came. If you are interested, you should study complete
aviation fuel systems that you may be able to find on the internet.
To answer your question, most fuel system do no rely on non-engine driven
pump to maintain the pressure although certain specialized my require such high
constant pressure that a separate pump designed to maintain that pressure is
used.
Scott Krueger
In a message dated 6/13/2012 10:37:48 A.M. Central Daylight Time,
gbfitz@swbell.net writes:
Does the Airflow Performance fuel injection use an
engine-powered pump, or does it rely on the electrical pump for fuel delivery
all the time? Is there a difference in the principle of operation of
this system compared to the standard Lycoming fuel injection system or the
Silver Hawk system?
Gary Fitzgerald
LNC2 ~70%
St. Charles, MO
Looking for a good deal on
a used or rebuildable (I)O-360