Rich wrote:

Hi George,

I'd sure like to visit "the other Oz"  (I live in the REAL Oz, Kansas)
some day.  Looks like a pretty interesting place.  But to your question ---

The systems that I am referring to returns the fuel to one of the mains with
a return line all the way to the tank.  The concept is to flow excess fuel to
cool the whole system, lines, fuel injector (or carb) and then dump this heated
fuel into the tank for heat dissipation.  Using a T is a bad idea, since much
of the fuel will recycle and will continue to heat up.  This could cause
vapor lock on a hot day, esp with a long idle, say leaving a fly-in (when my
Long EZ has gotten the warmest).  I even worry about the guys that
use a sump, since while it can provide some cooling, it will be nowhere near
what the fuel tank can provide since it will recycle relatively quickly with
a small sump volume.

The trick is to learn your system.  For instance, suppose your
pump puts out 30 GPH and the engine uses 15 GPH at cruise power.
Start with full  30 gals left and  30 gals right, and all returned fuel goes
to the
left tank, you would start, taxi, TO and climb on the left tank.  This
simplified example ignores the extra fuel burn in climb.

                           LEFT              RIGHT
START                 30                     30
1 hour on L          -15                       0
@ end of 1 ho       15                      30
1/2 hr on Rt        +7.5                    -15
@ end of 1.5 hr     22.5                   15
1 hr on Left          -15                       0
@ end of 2.5 hr      7.5                    15
1/2 hr on Rt           +7.5                 -15
@ end of 3 hr         15                      0
time to look for field, with all remaining
fuel in the left tank, no more fuel mgmt req'd
except landing before you run out.  :-)

Very simple system physically, pretty easy to use
once you think about it for a few minutes and fly
it a few times.  Simpler is ALWAYS better.
I dislike electrical fuel valves (they fail if they get
a bit sticky,  while I can turn harder if a manual
valve gets sticky - and they do -- and then I know to
lube or replace it before it fails).   Extra transfer
pumps are also unecessary, and somthing else to buy,
install, haul around and fail.
K. I. S. S.

Bill

I've been reading the thread on fuel problems & I like your
idea the best so far & it is pretty simple & sounds like the
most inexpensive way to go too.

Thanks

Rich
CH801

 
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