where is the exact location in the engine the evaporator system sensor switch on 2007 Ford Freestar

code p0451

2 answers
P0451 Fuel Tank Pressure Sensor Circuit Offset/Intermittent
Possible Causes Setting Conditions

FTP sensor connector is damaged (check pins for damage, and for moisture)
FTP sensor signal circuit has an intermittent open condition
FTP sensor signal circuit has an intermittent shorted condition
FTP sensor has failed
there are several sensors which one