Ford 2003 Mustang Workshop Manual page 1934

SECTION 303-04B: Fuel Charging and Controls — 4.6L (2V)
DESCRIPTION AND OPERATION
Fuel Charging And Controls
The fuel injection supply manifold (9F792):
delivers fuel to the fuel injector.
receives fuel from the fuel supply line.
The throttle body (9E926):
controls air supply to the upper intake manifold (9424) by positioning the throttle plate.
connects the accelerator cable (9A758) and the speed control actuator cable (9A825) (if
equipped) to the throttle lever.
is not adjustable.
cannot be cleaned.
The fuel injector (9F593):
is electrically operated by the powertrain control module (PCM) (12A650).
has an internal solenoid that opens a needle valve to inject fuel into the lower intake manifold.
atomizes the fuel as the fuel is delivered.
is deposit-resistant. Do not clean.
The fuel pressure relief valve (9H321):
is used to inspect and relieve fuel pressure.
Fuel Charging Wiring Connections
2003 Mustang Workshop Manual