The fuel cut valve is a device that discharges into a canister evaporative gas generated by fuel flow during driving, and prevents fuel from being discharged into the outside in the event that a vehicle leans more than 45 degrees or turns over.
The fuel vent valve discharges into a canister evaporative gas generated during fuel injection, and prevents excessive fueling, using the pressure of fuel tank.
FTIV is a device that maintains proper pressure in the fuel tank by draining or isolating fuel evaporative emissions to the canister, depending on the ECU signal from the PHEV.