I agree with Steve except I leave
the low boost off during taxi and run up but turn it on before the takeoff roll
and leave it on until back on the ground. My mechanic was told by CJ
Aviation (828 871 0421) who overhauled my fuel pump, the pump has
ran continuously in tests for over a 1,000 hours w/o failure. I also
recommend you purge each tank before start up to remove any air in the lines
which should prevent a loss of fuel to the engine when switching tanks.
Shane
IV-P 420 hrs
From: Lancair Mailing
List [mailto:lml@lancaironline.net] On Behalf Of Steve Colwell
Sent: Wednesday, September 24, 2014 6:13 AM
To: Lancair Mailing List
Subject: [LML] Mechanical Fuel Pump Oddities
Kevin,
I had the same problem on a warm day with warm fuel from an
above ground tank. My solution is to leave Low Boost on all the
time. The Dukes pump is not rated for continuous operation but mine is
still running at 200+ hours. Another plus is, if your engine pump fails
on takeoff, Low Boost will probably keep the engine running (maybe at reduced
power but still running). I believe Continental recommends Low Boost
above 10,000’ so the best explanation could be “they do
that”.
Steve Colwell IO-550 Legacy