F 450 4WD Super Duty V10-6.8L VIN Z CNG (2003)
Fuel Injector: Description and Operation
Gasoline Fuel System
FUEL INJECTOR
Fuel Injectors
The fuel injector (Figure 71) is a solenoid-operated valve that meters fuel flow to the engine. The fuel injector is opened and closed a constant number
of times per crankshaft revolution. The amount of fuel is controlled by the length of time the fuel injector is held open.
The fuel injector is normally closed and is operated by 12 volt VPWR from the electronic engine control power relay. The ground signal is controlled
by the PCM.
CAUTION: Do not apply battery positive voltage (B+) directly to the fuel injector electrical connector terminals. The solenoids may be damaged
internally in a matter of seconds.
The injector is the Deposit Resistant Injection (DRI) type and does not have to be cleaned. However, it can be flow checked and, if found outside of
specification, the fuel injector should be replaced.
