Marvin Kaye wrote:

Intended system for my LNC2 (can't very well call it a Lancair 360 without
a Lycoming O360, can I? <g>)is pretty much stock and as per the plans, at
least up to the firewall.

Tankage includes 2 mains in the wings (21 gal per side) and a 6-gallon
header tank.  Each main feeds through a finger screen via 1/4" hard line to
a dedicated lo pressure pump which keeps the header tank topped off.  The
lo-px pumps are automatically activated by a float switch which engages
both of their relays anytime it comes off the full position.  There will be
over-ride switches controlled by an AUTO/OFF/MANUAL switch to turn on
either or both pumps JIC the float switch fails either open or closed.
Flow from the mains to the header is confirmed visually through clear
tubing at the front of the console.  Mains will be vented via 1/4" hard
line to small NACA scoops on the outboard side of the winglets to put
slight positive pressure on the tanks.  Sump drains located just below the
fuel screens.  There will be partial ribs just outboard of the sumps with
slosh doors to keep fuel in the pickup bay.

The header tank has a sight gauge which is always visible on the pilot's
side of the radio stack... the pilot light for the transfer pumps will be
located behind the sight gauge in line with the fuel level at which the
pumps should turn on... no light on or failure of the light to extinguish
after required transfer time (timed alarm) means I need to switch to manual
transfer.  Header tank is vented from immediately below the filler cap via
1/4" hard line to the bottom of the fuselage, the exposed vent line is cut
at a 45deg angle facing into the relative wind to provide some tank
pressure.  I'm seriously considering installation of a second float switch
to a low-level (1/2 tank) annunciator with a verbal warning tied into the
intercom.  Tank has sump drain with draincock accessible inside nose gear
tunnel.

Header tank feeds out the bottom through another finger screen to the fuel
shut-off then out to a pair of series hi-px pumps and filters with check
valves and tees to allow operation similar to the schematic provided
earlier by Jeff;  system will be setup to operate with single pump only,
second one strictly for backup.  Hi-px pumps & filters feed directly to the
injector fuel rail.  Fuel pressure regulator will be located at end of fuel
rail, downstream from injectors, and will hook to a 3/8" return line which
plumbs back into the top of the header tank.  Fuel pressure sensor will be
located upstream of injectors.

Well, that about does it... if I've missed anything I'd certainly like to
hear about it.  All comments welcome.

    <Marv>

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