[quadstar87]

I can say that the PCM cuts fueling by way of signals through the PMD at whatever RPM is programmed, which is about 3700rpm on stock tunes, and the max allowed by the PCM otherwise is around 4300rpm, which may be when it would kill it with the FSOS. So the FSOS is only needed for the freak situation that somehow the PMD is just outputting signals for more fuel and the PCM cannot control it. So fracked up PMD is the only problem where I see the FSOS possibly being of use. This was unheard of before Flight Systems started making them.

Same here, I can see in the prom where the tunes cut fuel based on RPM but the base ECU logic is something we will probably never see :thumbsdow

 

[quadstar87]

Have there ever been any reports of the FSOL (fuel solenoid) getting stuck open? Was thinking this could be a case where the FSO solenoid would be needed.

Or would the IP not be able to produce pressure if that happened?

I've seen reports of PMD's going nuts and causing wide open throttle (allegedly) , but never saw follow-ups to see if it was the IP or PMD that caused it.