On Oct 5, 12:09 pm, Gene Seibel wrote:
On Oct 5, 7:47 am, es330td wrote:

If you are running on "BOTH" and there is an obstruction in a fuel
line, fuel could feed only from the other tank and you might find
yourself with fuel starvation long before you expect it. Changing
between left and right on a regular basis may let you discover such a
problem before it's an emergency. A close watch on fuel gauges and
being sensitive to heavy wing helps too.

My Mooney doesn't have a both. However, its nice to know that if I
ever did run out of gas, I could always switch to the other tank and
having something left. If you run out in a C-172 on "both" you're
done.

-Robert