I picked up
the idea from
the Eggenfellner Subaru group. They had had a couple of instances
where
pilots ran one tank dry and then couldn’t get the EFI pump to re-prime,
and ended up in off-field landings. It is now a mandatory change for
anyone running the Eggenfellner package
Before
installing the
bypass bleeder circuit, it would not re-prime unless I cracked open a
line
downstream of the pump.
Mark S.
I’m not
sure I get this. It
must be system design dependant. I have filled my tanks from dead
empty;
turned on the pump and immediately had fuel pressure. Ran the tanks
dry;
then added some fuel; turned on the pump – immediately had pressure.
True; I have done this on the ground, but should it be any different in
the
air. The key may be that the line from my sump tank to the pump has a
slight downward slope so the fuel will fill the line and the air goes
back to
the sump.
What does
the .025 bypass orifice do that
open injectors while engine cranking won’t do?
Al