Yukon/Denali 4WD V8-4.8L VIN V (2005)
Fuel Tank Pressure Sensor: Description and Operation
FUEL TANK PRESSURE SENSOR
The fuel tank pressure (FTP) sensor measures the difference between the pressure or vacuum in the fuel tank and outside air pressure. The control
module provides a 5-volt reference and a ground to the FTP sensor. The FTP sensor provides a signal voltage back to the control module that can vary
between 0.1-4.9 volts. A high FTP sensor voltage indicates a low fuel tank pressure or vacuum. A low FTP sensor voltage indicates a high fuel tank
pressure.