Yes, F series is now Kero/Diesel start and running engines. One thing to note, when using 7s NiMh pack the solenoids get a little hotter at this voltage, make sure you safety wire solenoid connections, don't want the heated barbs to soften tubing too much.

I have been doing torture tests on solenoids (since they were designed around 6 to 8 volt), powering it with 3s LiFe, which is about 1.5v higher than 7s NiMh and have not been able to burn one shut. I had one connected 1 hour straight last night, and tonight 5 hour straight and still works fine. In real life, the fuel solenoid will most likely be on no more than 15 minutes per most flights and with cool fuel running through it during most of the time.

Barry