Quote:
Originally Posted by Joshinator99
Agreed, that is how I have it wired. But the FSCM must still be telling the FC3 to ramp the primary pump up and down, otherwise why would Fore tell you to keep running the factory fuel pressure sensor...? 
Here are the pics from the Fore documentation and a layout of how my system is piped in, if that helps. |
It's constant, easy to verify start the car let it idle and look at your pressure gauge on the regulator. It's going to be whatever you have it set at.
If you didn't have the low side fuel pressure sensor the car would probably go nuts thinking it had no pressure and you wouldn't have any reference when logging if your lowsides keeping up.
All the FC3 is looking for on the remote side is a signal over 6.5 volts making the relay either on or off. You can pull the cover off the FC3 it's just a regular relay and fuse inside for each pump circuit.
If the FPCM or whatever the brains called was still controlling the primary pump the relay inside the FC3 would melt in no time, it's not made to be shutting on and off rapidly to contol fuel pressure. It's just a standard relay for each pump circuit.