929 V6-3.0L SOHC (1989)
Rollover Valve: Description and Operation
Fuel Tank
Check And Cut Valve
The check and cut valve, located in the body panel above the fuel tank, is part of the evaporative emission control system. It has three functions:
1.
Vents the fuel tank to the atmosphere if the pressure in the tank exceeds approx. 0.78 - 1.0 psi (5.37 - 6.87 kPa), to prevent damage to the fuel
tank.
2.
Allows air from the atmosphere to enter the tank through the valve, if the pressure in the tank is approx. 0.14 - 0.71 psi (0.98 - 4.91 kPa) less than
atmospheric, to prevent damage to the fuel tank.
3.
Blocks fuel from leaking through the evaporative system in the event the vehicle is overturned.
