relieving fuel pressure

When you relieve the fuel pressure, where is the fitting you loosen at? I'm doing this on a 91 corolla. Is the fitting underneath? Near the engine? Where is it at?

I usually pull the fuel pump fuse and start the car and let it run untill the system loses pressure and the car dies, takes about 3-5 seconds usually. This is the procedure I was taught in school so im sure its safe.