I noticed today that my fuel pressure was very low to nonexistent during a test flight. The pressure ranged from a high of about 1.5 to a low fluctuating between 0.2 to 0.0, ahem. The plane was set up in cruise at about 2300 rpm, fuel flow about 9 gph, with IAS around 135kts. The engine is an O-360. The fuel flow sensor is a Kavlico P4055-15G that was supplied as part of the G3X system when purchased from Stein. The sensor is mounted on a Van's sensor manifold, using a Van's braided line that connects to a restrictor mounted to a tee off the mechanical fuel pump (the other branch goes to the Red Cube, then on to the carb.) The G3X configuration seems to be correct - if the only thing that needs to be done is set the sensor type and gauge markings. The display range is configured 0-10 psi
So, what pressure should I be seeing? I was thinking it should be at least 3 psi. Is the restrictor messing up the pressure reading? Is the mech pump failing? Could the sensor be bad?
So, what pressure should I be seeing? I was thinking it should be at least 3 psi. Is the restrictor messing up the pressure reading? Is the mech pump failing? Could the sensor be bad?