Dennis.Kirby(at)kirtland.
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 Posted: Mon Nov 06, 2006 10:38 am Post subject: Facet pump installation (UNCLASSIFIED) |
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Classification: UNCLASSIFIED
Caveats: NONE
Lanny Fetterman asked: << install a facet fuel pump in parallel with
the mechanical pump. If anyone has ... any suggestions before I start
this project, I would appreciate the help. I read that the pump should
be placed below the level of the fuel tanks, Is it best to wire it to
the ignition
switch so it runs all the time, as suggested by one of the other pilots
taking the course, or a toggle switch? Lanny Fetterman >>
Hi, Lanny -
Kolb List members are somewhat split in opinions for how to install the
Facet pump. Some like 'em parallel, some like 'em in series with the
mech pump. The archives are full of Kolb Members' personal opinions for
the benefits of either installation. Personally, I plumbed mine in
series and have had zero problems. Advantages are, fewer connections to
potentially cause a problem. The Facet is designed to allow fuel to
continue flowing thru it when it is off or failed. Although I have
heard one story of a Facet pump blocking the fuel flow when it failed,
this was the exception, not the rule.
I also followed Richard Pike's advice to keep the Facet pump running all
the time while flying. Given that this pump boasts an average
mean-time-between-failure rate of tens of thousands of hours, you are
not really "saving" any potential pump life by leaving it off. Mine has
an on-off switch, and I only turn it off during my runup, to ensure the
mech pump is still working. After that, I turn it back on, and leave it
on for the entire flight.
Dennis Kirby
Mark-III, 912ul, 59.8 hrs
Cedar Crest, NM
Classification: UNCLASSIFIED
Caveats: NONE
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