G3X Erratic Engine Indications

I'm in phase one testing with my new RV-14A. I have a persistent problem with MAP and Fuel Pressure indications simultaneously becoming erratic after about 30 minutes of flight. MAP begins fluctuating about .5 inch while FP fluctuates about 4 PSI. I've checked all connectors on the Stein built harnesses and they look fine. I've replaced the MAP sensor and tested the FP sensor with regulated air pressure. I've had 2 A&Ps and an avionics tech look over my installation. I'm about to replace the GEA-24.

Has anyone had a similar experience?

Brent

Yup. Get spurious fuel pressure warnings all the time, manifold pressure is like yours.

pm sent.


Jay

If you don't have Gauge Vibration Dampers installed, they will work very well to stop fluctuations you're describing. I use ones from McMaster-Carr:

Brass, 1/8 NPT Male x Female, 0.004" Orifice Diameter, PN 3820K11

Some basics; check your instrument (GEA-24 especially) grounds, also ensure you have good grounds battery to airframe, airframe to engine i.e good ground strap from engine to airframe.