You should begin fuel rail servicing on Zetec engines by opening the fuel pressure before eliminating all sources of flame and smoke exposure thanks to dangerous fuel vapors. Your first task should be to remove the battery ground cable followed by the air cleaner outlet tube and the
Accelerator Cable through its retaining clip followed by disconnecting its inner cable from the
Throttle Body. Finish by rotating the outer cable. Detach the speed control cable first if equipped before you can disconnect the
Fuel Injector electrical connectors along with the fuel line. The fuel supply manifold with fuel injector can be removed after the clip slides off to free the injector from the manifold. Discard the O-ring seals. Installation proceeds in the opposite direction of removal while treating new O-ring seals with engine oil for easier installation and demanding replacement of these seals with new ones.