Rich wrote:

I did buy the Andair fuel selector with return. I

do want to return

the fuel to the inboard tank but the outboard tank

is T'd to the

inboard tank. My question was if the inboard tank

would overflow or if

the inboard & outboard tank would equalize

(inboard & outboard tanks

are in both wings, 4 total).

I got an answer today by a physics teacher (it

sounded pretty good).

He said that if I use 3/8" fuel line to feed the

engine & 1/4" line

for the return then the inboard tank won't

overflow... also something

about the slight pressure in the inboard tank from

the return fuel

which won't allow the outboard tank to flow as

fast as the inboard.

Thanks
Rich

I thought it was obvious that more fuel is sucked
out than is
returned. I don't think you need the line size
disparity.
Are you going to have separate vents for each tank?

In my experience with Cessna's the tanks rarely
equalize
for some strange reason.

Paul Lamar

Vance Jaqua wrote:

I would fire that physics teacher - unless you did not
give him the full story. If you are using the two
level valve with return switched to the tank that you
are using from, the tank will not overflow regardless
of line size. If you are doing the old Bonanza scheme
of
always returning to the same tank, and only partly
depleting that tank on the first portion of your
flight, then you have the possibility of overflowing.
Also if you have a cap on an inboard tank that is "Tee
ed" to an outboard tank, you are going to overflow on
the ramp. Many fuel injection systems return as much
as 75 percent of the inflow at low power cruise
operation.
If you are not confused yet - give us a second chance
:-) Vance

The Aircraft Rotary Engine Newsletter.              Powered by Linux.

http://home.earthlink.net/~rotaryeng/            http://www.linux.org