It sounds like the gauge trimmers have not been adjusted correctly and you are tripping the failsafe. With the system in test and spraying 100%, the SC should be set so 5 or 6 of the 8 bars are lit. Then turn the WL full left(CCW) and WH full right (CW) and try again. You can also turn the failsafe delay to maximum delay. This should get the system started then you need to adjust each individually from there, either before or after your dyno tuning are done..

The system should still be spraying while a failsafe event occurs. The pump should still be running and system injecting. Check the wideband to confirm this.