Higher fuel pressure after transducer install

[Michael Burbidge]

I have an O-320. I just installed a JPI engine monitor, with a floscan fuel flow transducer.

My fuel pressure before the install was 4.5 - 5 psi. After the install it is 7 psi. According to the Lycoming Operators manual 7 is still acceptable. But I'm just wondering if a fuel flow transducer can increase fuel pressure? I assume it adds some resistance to the circuit and so it makes some sense that fuel pressure would increase.

Michael-

[TS Flightlines]

Michael, could be since the orifice in the transducer is about .180.

Tom

[Kyle Boatright]

The difference could also be explained by differences in the sensors or the instruments they are attached to.

When I switched from analog gauges to digital in my RV-6, both my oil temperature and oil pressure readings dropped, even though nothing else changed.