The low pressure fuel pump mounted on the fuel tank is the one that primes the system, not the HPFP.
I have two LED's installed monitoring it (read here ) and they light up every time I unlock or open the doors.
I believe the sensor you are looking for is what I labelled as #3. Your issue could...
Just took my car to the car wash and on my way home the air coming through the HVAC started making a weird noise. I started playing with the vent modes and could not feel any air coming out of the vents. Came home, pulled the fuse to reset the system, waited 10 minutes and nothing... same noise...
Yeah, I learnt about it while troubleshooting an electrical issue I'm still chasing. All AWD's have it due to the tank being split in the middle (saddle tank) to make room for the drive shaft. Almost bought a new one of those.
A friend of mine who owned a 2010 Taurus SEL had the seat overheat and shorted to the point it burnt a hole all the way though his pants.
Have a scape plan prepared, just in case... and butt-monitor the temperature closely.
There are two covers under the rear seat, one for the pump (passenger side) and one for the sender (drivers side).
As said, check for leaks on those gaskets.
I recently saw an SHO fuel tank in a scrap yard, it has like 3 hard plastic like hoses running on top with quick connectors on multiple...