"Stan Prevost" wrote:

No, when I turn on the boost pump, thus increasing the fuel pressure to
the sensor and to the engine-driven pump, the flow indication decreases
to a new steady-state value until I turn it off, then it increases again
to its former steady-state indication. If I turn it on again, it
decreases again. Appears to be something unique to that sensor type since
it does it in both airplanes I fly that are equipped with the Shadin
system.

What kind of sensor is it? It's a turbine type, right?

Higher pressure giving lower flow indication is what is wierd. Actually,
we would like it to not change.

Interesting problem. Perhaps the higher static pressure is putting some
kind of friction load on the turbine shaft, maybe by deforming an o-ring
seal or some such.

--
Dan
C172RG at BFM