Bulent Aliev wrote:

I would like to get some idea, what is the best way to build the fuel
return system of the 13b in a Cozy. Per plans we have two tanks with
fuel selector valve. I have my own ideas, but would like to hear from
some people with more experience.
How to prevent one tank from over filling by the return fuel, without
having a complicated pilot managed fuel system?
Bulent

Perry Mick wrote:

I welded up a steel sump tank that mounts on the firewall, lower than the
tank sumps.  This tank contains two fuel-injection pumps.  My fuel system
is completely Long-EZ stock up to this point.  My little tank is located
where the gascolator would probably be otherwise, and functions in a
similar manner, with a fuel drain on the bottom.  Gravity feed from the
single line from the tank selector to this sump tank.  This little tank has
it's
own vent line up to the top of the cowl.  The two fuel pump outlets run
through check-valves to a common line to the engine.  The fuel return from
the engine is to this tank, not the main tanks.  Thus no modification was
required from the Long-EZ plans.

Have had absolutely no problems with this system for 70 hours now,
(35 ground tests, 35 in the air).  Before first flight I ran the engine for

about 10 minutes at a high power setting with the nose elevated 2 ft.
in the air, just to make sure the fuel flowed ok in the climb.

My other concern initially was having it behind the firewall, that's why I
made it out of steel.  My guess is it holds about a half-gallon of fuel.


Perry J. Mick
Mick Duckt N7XR
http://www.mickaircraft.com/duckt.htm

 
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