CorvAircraft> fuel system pressure switch, Langford

[601corvair]

Hi All:

I have heard from lots of folks off list about this
 an accept it as a good idea.  I was concerned about utilizing oil pressure
to shut the system off.  Mark's idea which i have re-posted below solves this concern.
My issue was that i could see a situation where i could have an oil pressure drop and be willing
to sacrifice the short block for 30 sec of thrust.  This approach solves that because if
i lose the ignition it is going to stop anyway.

Mark,  or anyone, do you have a part number or more specifics of the switch, or has anyone actually installed
one of these?  Anyone flown behind it?  It seems simple, and elegant, and because its electrical a relatively easy
retro-fit.  Thank all phill 






Message: 13
Date: Sat, 15 Sep 2007 12:31:53 -0500
From: "Mark Langford" <n56ml at hiwaay.net>
Subject: Re: CorvAircraft> 
Message: 13
Date: Sat, 15 Sep 2007 12:31:53 -0500
From: "Mark Langford" <n56ml at hiwaay.net>
Subject: Re: CorvAircraft> fuel system pressure switch
To: "Corvair engines for homebuilt aircraft" <corvaircraft at mylist.net>
Message-ID: <00a401c7f7be$4e797ca0$6401a8c0 at 1700xp>
Content-Type: text/plain; charset="iso-8859-1"

VairHeads,

One option is the VW Rabbit/Golf/Jetta/etc fuel pump relay.  This $30
 piece
has been working flawessly in millions of cars since about 1974.    The
relay energizes the fuel pump any time the starter is operated, and
 anytime
an ignition signal (from the coil) is present.  So when your engine
 quits,
so does your fuel pump.   If you try to restart it, you have fuel
 pressure
again.  If you crash on takeoff and your engine quits, so does the fuel
pump.   No switches, no thinking, it's all automatic.  The only fuel
 pump
relay failure I've ever seen is when the antenna grommet falls out of a
rusty car and water drips down onto the fuse box, and into the relay,
 but
even that one is rare.  I have one of these for my plane, but admit to
 not
having installed it yet or flight tested it, but the only reason is
 that I
simply haven't gotten around to it.  To me, this is the way to go,
 coupled
with the backup system
 (http://home.hiwaay.net/~langford/fuel/index.html).



Mark Langford, Huntsville, Alabama
see KR2S project N56ML at http://home.hiwaay.net/~langford
email to N56ML "at" hiwaay.netTo: "Corvair engines for homebuilt aircraft" <corvaircraft at mylist.net>
Message-ID: <00a401c7f7be$4e797ca0$6401a8c0 at 1700xp>
Content-Type: text/plain; charset="iso-8859-1"

VairHeads,

One option is the VW Rabbit/Golf/Jetta/etc fuel pump relay.  This $30
 piece
has been working flawessly in millions of cars since about 1974.    The
relay energizes the fuel pump any time the starter is operated, and
 anytime
an ignition signal (from the coil) is present.  So when your engine
 quits,
so does your fuel pump.   If you try to restart it, you have fuel
 pressure
again.  If you crash on takeoff and your engine quits, so does the fuel
pump.   No switches, no thinking, it's all automatic.  The only fuel
 pump
relay failure I've ever seen is when the antenna grommet falls out of a
rusty car and water drips down onto the fuse box, and into the relay,
 but
even that one is rare.  I have one of these for my plane, but admit to
 not
having installed it yet or flight tested it, but the only reason is
 that I
simply haven't gotten around to it.  To me, this is the way to go,
 coupled
with the backup system
 (http://home.hiwaay.net/~langford/fuel/index.html).

Mark Langford, Huntsville, Alabama
see KR2S project N56ML at http://home.hiwaay.net/~langford
email to N56ML "at" hiwaay.net
 
       
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