Rich wrote:

Bill, 2 tanks are in each wing. Each wing is to be connected to the
Andair fuel selector with return. The left wing tanks will NOT be 'T'd
to the right wing tanks.

Attached is a sketch.

Rich

Now I understand. TWO tanks in each wing. This is dangerous Rich.
If one tank in one wing has its line uncovered you risk not
feeding from that wing at all.

The outer tank should feed to the inner tank and then only
feed from the inner tank to the selector valve. Usually this is done
with a large diameter pipe between the two and a one way flapper valve that
prevents fuel from flowing from the inner tank back out to the outer tank.
Also the outer tank should be vented. Return fuel can go to both
OUTER tanks in each wing.

When you are low on fuel don't slip the airplane as you might
slip with the selected tanks down. I usually keep my fuel selector
on both and if I have any fuel in the upper wing the engine keeps
running. Naturally! If you have to think about which way you are slipping
and which wing is selected there is of course  more chance for error.

High wing Cessna's have far fewer tank selection based accidents
than a low wing system like you describe. Probably because
of the both position on the selector valve.

What would be even better is two small tanks in both inner wing
tanks with one way valves so if you slip you will have enough fuel
to keep the engine running for a few minutes.

Paul Lamar

This is a high wing installation, not a low wing.
A Zenith CH-801 looks similar to a C152/C172

Rich

Does not matter. Same problem. High wing or low wing.
The fuel pickup line position should be close to the cockpit
and that is what can become uncovered in a slip.

Paul Lamar
 
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