fuel flow sensing

[Bill Williams]

	The pressure will be under 10 PSI so it will not pose much of a
problem. The vane or turbine meters may not meet your requirements for
accuracy. There is a positive displacement type pump that would be cheap,
accurate and reversible called a peristalsis pump. It is usually used to
meter chemicals etc. but with the right material choices would make an
excellent flow meter. It is simply a tube arranged inside a circular
housing with two or more rollers compressing the tube and rotating within
the housing. A fixed volume is trapped between the rollers and the
rotational rate is proportional to the flow. All hinges on the correct
choice of tube for chemical compatibility and mechanical characteristics.
Try the local chemical supply houses for one of these pumps and the
tubing. 
---                                   Bill in Boulder   "Engineering as
an Art Form"                                ---