Hi Rob / Trevor,
After reading normally for several test flights, the fuel pressure began to fluctuate upwards on the last flight with our EE3500. When the boost pump was turned on it would return to normal readings. We checked the fuel filters etc and were found clean. Next flight, before engine start, the fuel pressure went to 120psi when the screen was turned on then normal. With the engine running it was showing up to 500psi. Then it would return to normal. Any clues ? Thank you.
John.