<... was concerned about a main pump switch that could be accidentally
turned off in flight ...>
I would be inclined to look at that concern as exaggerated if not totally
bogus. A switch on the panel cannot be turned off completely
accidentally - you are deliberately turning something off,
and if you hit the wrong switch, the engine will die so fast that you will
still have your hand on the switch and can turn it back on immediately.
Additionally, how often are you manipulating panel switches at altitudes
where a 1-second inadvertent shutdown would pose a problem? If you
are really REALLY afraid of inadvertent shutdown, how about using guarded
switches on the hp pumps?
I would NOT hard wire a pump through the master switch ... Jim S.
Paul,
I don't think that it matters which port you use. Either one
should give it
the manifold pressure input. You definitely want to block the
other one, or
if you're going to use a manifold pressure gauge, that would be a good
point
to connect it.
I was interested in the switch idea on the fuel pump. I have my
auxiliary
pump on a switch, but my primary pump runs as long as the master switch
is
on. I was concerned about having a switch on the main pump that
could be
accidentally turned off in flight. I have noticed on occasion
though,
during my test runs that there was some fuel in the intake plenum that
accumulated a while after shut down. I assume that this is due
to some
leakage by the injectors caused by still having fuel pressure on the
fuel
rail.
I am interested to see what other responses you get on the fuel pump
switch.
I may want to consider putting one on, though it would have to be located
where it wouldn't get shut off accidentally.
Steve Brooks
Cozy MKIV 13BT
CH 25 - about ready to shoot the primer
-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
On
Behalf Of sqpilot@earthlink
Sent: Wednesday, March 17, 2004 12:14 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] mainfold
hose
I have to ask another question. My MicroTech ECU has a male fitting
onto
which I connected the supplied rubber hose to the TWM throttlebody.
The TWM
throttlebody, however has two male fittings to which the hose could
be
connected. They are both in the same area, so it shouldn't matter
which one
I connect to. The question is.....Should I plug the one that
I am not
using? Right now I just connected a 1 inch long hose to it and
stuck a bolt
into the end of the hose to plug it, not knowing if I should have plugged
it
or not.
One more question, please. I just finished
hooking up two toggle
switches to allow me to turn the high pressure fuel pumps on and off.
Recently, there have been a few posts recommending turning the fuel
pump off
prior to engine shutdown to eliminate those few drops of fuel in the
throttlebody. Do you just turn the pumps off for a few seconds
and then
turn off the ignition, or just turn off the pumps and let the engine
die
from fuel exhaustion, similar to pulling the mixture lever to shut
down a
Lycoming? Inquiring mind wants to know. Thanks in
advance for all replies
and advice, as ususal. Paul Conner, 13b powered SQ2000,
engine running.
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