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1. 03:58 AM - Re: Running tank dry (N1BZRich@AOL.COM)
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| Subject: | Re: Running tank dry |
Good morning Bob,
Congratulations on your Lightning, and as you said, it just gets
better and better. To answer your question, I have run a tank dry during phase
one testing on several occasions when calibrating my fuel quantity gauges
and it starts up pretty quickly when you do switch tanks. But there are a
few things to think about. The main thing that caught me slightly off guard
was that it quit immediately - no surging or missing a little before
quitting as I have seen when I used to run a tank dry on long cross countries
in
past Bonanzas I have owned. With those there would be some surging before
it actually quit and that would give you some time to change tanks before
the engine actually quite. Not so on this set up - it would be running
fine, then silence. Even though I was expecting it, it was a little startling
to have it just stop running all at once. I'm not sure why this happens,
but perhaps because of the carb instead of a fuel injection as on the
Bonanzas. But when I switched to the other tank, it started almost
immediately. Quickly enough that I didn't have time to switch on the electric
fuel
boost pump.
However, having done this a few times, I now know that there is at
least one thing you can see that will give you some warning that the engine is
getting ready to stop as it runs out of fuel. Just watch the fuel flow
indicator and you will see it increase just before the engine quits. What is
happening is that as the fuel flow is interrupted, and some air is now in
the fuel line, the fuel flow transmitter will start to spin faster thus
giving a false indication of increased fuel flow. So if you happen to be
watching the fuel flow as the exact time the fuel tank is being exhausted, you
will see the fuel flow go up. Switch tanks at this time and the engine
will not quit before you get better fuel flow from the new tank.
As with all things experimental, this is based on my experience. Your
mileage may vary.
Blue Skies,
Buz Rich
In a message dated 12/1/2011 1:31:07 A.M. Eastern Standard Time,
rbelshe@comcast.net writes:
--> Lightning-List message posted by: "rbelshe@comcast.net"
<rbelshe@comcast.net>
Last July I purchased Jim Johannes's beautiful Lightning from his estate.
I now have 32 hrs and 77 landings, it just gets better!
I'm writing to ask the experience of the group in running one tank dry.
How long does it take to restart after you switch to the other tank? Does
one need to use the boost pump?
My fuel selector does not have a "both" position.
Thanks to all who take the time to answer.
Bob Belshe
N563J
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=359983#359983
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