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$.02 from a 235/320 owmer on a fuel system that has worked for 600m hrs,
no probs. 320J has a 12 gal day tk and two 15 gal wing tks. The day tank
has a sight guage with an 1/8" valve for shut off purposes on the bottom,
easily reachable from PIC position. The wing tanks run through Facet Fuel
Pumps, (under seat pans)to the day tank running alongside the sight guage
on the
instrument panel. All tubing is clear 1/8" polyurathane which is chafed
with electrical tape when going through instrument panel or through epoxy
walls, etc. All three lines are visible to the pilot. There are no
gauges or sensors in this approach, except a high fuel level in the day
tank to keep from pumping overboard if Idope off. OPERATION: After
burning off 5 to 6 gals from the day tank, I start both facet fuel
pumpsand time each pumpinglength, I know that I have 40 minutes of
cumulative pumping time to drain the 30 gal wing tanks and visual evidence
when each tank runs dry, (bubbles appear in clear tbg flow lines and the
Facet pumps speed up) There are no valves to switch, no fuel gauges, and I
know positively when tanks are dry and I can time fuel usage using the
calibrated sight guage. Peace of mind, knowing that if the Pumps fail, or
whatever I can fly for mas o menos 1 hour with the day tank volume, from 5
to 12 gals. Too many fuel lines in cockpit area ?? With the day tank, you
have only one additional, for the sight gauge. Have had this system for
about 10 years, I change Polyurathane tubing every 4 years as precaution,
old tbg looks good even at the hose clamp areas.. I hate to rely on gauges
when I'm popeye and destination is a stretch with 300'and a half...
Don Skeele DPSKE@Teleport.com (503)769-2563
dpske@teleport.COM
LML website: http://www.olsusa.com/Users/Mkaye/maillist.html
Builders' Bookstore: http://www.buildersbooks.com/lancair
Please send your photos and drawings to marvkaye@olsusa.com.
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