Where is the fuel return valve on Kia Sportage 96 model?

there is no valve, there is a return fuel injector hose coming off the fuel rail; returning to the tank. It is reghulated by a fuel injector pressure regulator. Most of them are controlled by a vacuum hose, some newer ones maybe electronically controlled, depends on vehicle. The 1996 Kia Sportage is vacuum controlled and mounted directly to the front end of the fuel rail. Looks like a top hat about size of a quarter in diameter.