1978 M20J 201
Looking for some advise. Just to be clear let me get some background on this. I noticed on sevral flights that while in different phase of flight the fuel pressure would slowly increase past redline. Turning on the auxiliary had no effect. It would then work its way back down to nominal question pressure.
I went to fly the plane this morning for a breakfast flight and went to start it as normal. When I turned on the electric fuel pump it came onto 14 psi and then when I turned it off it settled back to just about 5 psi prior to start. I then started the aircraft with the boost pump off. As soon as the engine started I watched it for a second as the fuel pressure pegged past redline and then shut the aircraft off
I appreciate your insight