F 150 Heritage 4WD Pickup V8-5.4L SOHC VIN Z Bi-fuel (2004)
Fuel Vaporizer Assembly: Description and Operation
VAPORIZER
Liquid propane enters the vaporizer and is then heated to a gaseous state. The gaseous fuel is released to the compuvalve at 40 psia for engine coolant
temperatures greater than or equal to 25°C (77°F). Below this temperature, delivery pressure decreases with reduction of engine coolant temperature to a
minimum of 32 psia at 0°C (32°F), optimizing vaporization capacity.