[mannykannot]

There's lots of information here on the sequence of operations followed in starting the F1 motors of the Saturn V first stage:

https://home.kpn.nl/panhu001/Saturn_V/Saturn_V_info/F-1_engi...

[mtlebe]

Related video: How To Start The Massive F-1 Rocket Engine from Scott Manley: https://www.youtube.com/watch?v=2cldgl9IIyY