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A while ago I reworked my fuel system in the course
of chasing a non-related engine problem.
One test I did was to measure the gravity fuel flow
rate at the gascolator. With the gascolator valve open, fuel would drain
from the header tank at about 5 gal per hour. Now, this is only 1/4 of the
full throttle fuel flow and makes it obvious that wherever the first pump in the
system is - it has to suck fuel from the tank.
I elected to mount the boost pump as close to the
shutoff valve as I could and it is at the top of the passenger foot
well.
Now it works fine for pumping fuel but it makes
about as much noise as the engine while on the ground.
I find that I'm always reaching for the switch to
kill the noise when halfway through rollout.
Low, and forward of the firewall is probably a
better spot.
Mark Ravinski
N360KB 1365 hrs.
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