snips of course :-)

I think it is a sub class of a manometer in that the
pressure in
the top of the tank is always the same pressure as
in the top of the U-tube
there fore it will always read the proper fuel
level.

Usually, in the classic manometer the top of the U
tube goes to
an independent reference pressure. The intention of
course is to
determine the pressure of the unknown source
compared to the
reference pressure.

IMHO it is stretching things to call it a manometer
Vance :-)

Paul Lamar

Hey! it is a simple manometer measurung the pressure
at the bottom of the tank in inches (millimeters) of
fuel.
what is so tough about that? - Vance

Come on Vance lets be reasonably about this :-) The other side of the
U tube is the tank it self and there is NEVER  a difference in the height
of the two columns of fluid. Pressure is measured in a  manometers 
by measuring the distance between the height of the two columns of fluid.
By your definition there never is any pressure in the tank.

Paul Lamar
 
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