Attached is a link to flight data from this flight.
Tuesday morning I had some pretty strong fuel pressure fluctuations in a constant cycling pattern 24-21 psi . I didn't notice the fluctuations until after I was at altitude and my boost pump was off. Returned to the airport and inspected all connections; no leaks.
Ground running shows same fluctuation pattern. Turning on the boost pump eliminated any fluctuations, the pressure held solid at 28.0 psi. So, I think that eliminates the possibility of transducer/electrical issues.
Background:
-My mechanical fuel pump only has around 20 hours on it since new. I had replaced it at the time because I was getting some smaller fluctuations and couldn't find any leaks. The pump replacement turned out to be unnecessary, as I later found a hard to access connection, that I guess I missed torquing. It was seeping. At that point, I verified that all fittings were properly torqued. The last 20-ish hours have been trouble free until last flight.
Any ideas?
How likely is it that I have a bad mech pump with only 20 hours on it?
Flight Data:
Ground Run:
Thanks
Tuesday morning I had some pretty strong fuel pressure fluctuations in a constant cycling pattern 24-21 psi . I didn't notice the fluctuations until after I was at altitude and my boost pump was off. Returned to the airport and inspected all connections; no leaks.
Ground running shows same fluctuation pattern. Turning on the boost pump eliminated any fluctuations, the pressure held solid at 28.0 psi. So, I think that eliminates the possibility of transducer/electrical issues.
Background:
-My mechanical fuel pump only has around 20 hours on it since new. I had replaced it at the time because I was getting some smaller fluctuations and couldn't find any leaks. The pump replacement turned out to be unnecessary, as I later found a hard to access connection, that I guess I missed torquing. It was seeping. At that point, I verified that all fittings were properly torqued. The last 20-ish hours have been trouble free until last flight.
Any ideas?
How likely is it that I have a bad mech pump with only 20 hours on it?
Flight Data:
Ground Run:
Thanks