Dan,
Fuel flow is what we really care about. It is roughly proportional to
metered fuel pressure. I installed sensors that measure actual fuel flow so
metered fuel pressure is somewhat redundant. For these reasons I monitor
unmetered fuel pressure. My logic is it may give me a warning of fuel pump
failure or fuel line contriction before it would be reflected in the fuel
flow. Paul Bricker
N63PB

-----Original Message-----
From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Dan
Ballin
Sent: Monday, April 19, 2010 1:39 PM
To: lml@lancaironline.net
Subject: [LML] Re: Fuel Pressure Setup

While I think this is all good information, the original question Jon
had and I have is how to monitor fuel pressure.  The setup procedure
using SID97 is a different issue.  I think the more interesting
question is does one monitor metered or unmetered fuel pressure in the
cockpit.  It seems that TCM and at least Coumbia (Cessna)
recommend/use metered and that Lancair generally sets up their
aircraft to use unmetered.  I haven't gotten a good answer as to why
and what the advantages and disadvanages are.  Obviously the values
are different, but they are measuring essentially the same thing.

Can anyone comment on what advantage/disadvantage there is to using a
metered vs unmetered source for you fuel pressure measurement while
flying.

Dan Ballin
LEG2 #286

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