My 2001 Chevy Prizm still won't start after replacing the ECM

Ok guys, the mechanic installed a remanufactured ECM on the 2001 Chevy Prizm but it still isn't starting. The spark plugs, coils, and fuel injectors are fine and working. The first mechanic (NTB) told me that the Prizm doesn't have a fuel pressure regulator but O'Reilly's told me that it does have one. Can you show me a diagram of exactly where the fuel pressure regulator is location in the 2001 Prizm? Also, will it be easy to replace. Thanks!