Aeromotive 14137 - 04-06 SUBARU 2.5L STI FUEL RAIL SYSTEM - Manual (Page 10)

43. Reconnect the battery and turn the ignition to the ON position WITHOUT starting the
car. After several second turn the ignition key to the OFF position, wait one minute.
Repeat this process until you pressurize the fuel system.
44. Adjust the fuel pressure regulator to the desired fuel pressure. Once the fuel pressure
gauge registers the desired fuel system pressure and there are no fuel leaks, start the
engine.
45. With fuel pressure in the system, check for leaks from and around all the fuel system
components and all fuel lines and connections. If any fuel leaks are found, turn the
ignition key to the OFF position, remove any spilled gasoline and repair the leak before
proceeding.
46. Once the fuel system has been confirmed to be leak free, test drive the vehicle to insure
proper operation and re-check the fuel and coolant systems for leaks. If any leaks are
found, immediately shutoff the engine and repair the leak(s).