After the last flight in my Rocket (IO-540) I fueled it up and then restarted it (engine was warm). It started fine but the fuel pressure did not come up properly - stayed around 6 - 8 psi. I switched on the boost pump and as the pressure came up over 24 psi I switched the boost pump back off. The fuel pressure stayed up. There were no issues with the fuel pressure during the flight immediately previous.
I have subsequently started it cold and the fuel pressure comes up fine.
There are 250 hours on the fuel pump, 100 in the current setup (and many flights on much warmer days), and I have never had this problem previously.
Is there a failure mode with the engine driven fuel pump that occurs when it is warm as opposed to cold?
Could this just be a vapor lock anomaly?
I have subsequently started it cold and the fuel pressure comes up fine.
There are 250 hours on the fuel pump, 100 in the current setup (and many flights on much warmer days), and I have never had this problem previously.
Is there a failure mode with the engine driven fuel pump that occurs when it is warm as opposed to cold?
Could this just be a vapor lock anomaly?