Relieve fuel pressure, disconnect battery cable, remove intake manifold cover and upper intake manifold. Disconnect electrical connectors from fuel injectors. For 2001 models, disconnect vacuum hose and fuel return hose from
Fuel Pressure Regulator, and fuel supply hose from front fuel rail. For 2002 and later models, disconnect crossover hose from fuel rails or fuel hose from junction block. Remove fuel rail and injectors as one unit. Remove seal ring from each injector bore in cylinder head. Lubricate new cushion rings and O-rings with engine oil, insert fuel strainer into top of each injector, attach lower O-rings. Place injectors into fuel rail, lubricate new seal rings with engine oil, press into injector bore in intake manifold. Set injectors and fuel rail assembly on intake manifold, tighten fuel rail bolts. Reconnect battery cable, activate ignition switch to ON, inspect for leaks.