"Jim Macklin" wrote in message
news:C18Tf.118046$QW2.74826@dukeread08...

Fuel has weight, a little less than .5 pounds per foot of
distance. A high wing Cessna has about 3-4 feet between the
fuel tank and the carb float. The float in the bowl is
raised by the liquid fuel in the bowl and by a lever,
presses the needle valve closed, stopping the flow of fuel
by gravity.

In this case it's a low-wing twin - the engines are (probably) slightly
above the tanks - very little in it either way.