The Ford Explorer mixes fuel and air under pressure with a fuel injector. This function was previously performed passively by carburetors until the late 1980s. One advantage of fuel injectors is the programmable firmware that allows the fuel injector to handle different fuels. A fuel injector includes only the nozzle and valve; it still requires the pump to pressurize the fuel.
Determine which fuel injector your Ford Explorer will need. This depends not only on the make and model, but also the engine size. 1991 to 1994 models have a 4.0L engine and 1995 to 2001 models add the option for a 5.0L Windsor engine. Models made from 2000 to 2005 may be equipped with the 4.0L Cologne or 4.6L Modular engine.
Relieve the fuel system pressure and remove the intake manifold. Disconnect the spring lock coupling and the mounting bolt for the fuel supply tube bracket with a socket wrench.
Disconnect the connectors for the fuel injector electrical harness, fuel pressure sensor, temperature sensor and vacuum hose.
Unscrew the mounting bolts for the fuel rail with a socket wrench and remove the fuel rail and injectors from the engine compartment as an assembly. Discard the old O-rings.
Install the new fuel injector by reversing the removal procedure. Lubricate the new O-rings with clean engine oil before you install them. Use a torque wrench to tighten the fuel rail bolts to 17 foot pounds and the fuel supply bracket bolt to 71 inch pounds.
