A technician should start fuel rail servicing and repairing by removing the upper intake manifold. Service begins with releasing the spring lock couplings of the fuel tubes and progresses to unplug the electrical and vacuum connectors of the Fuel Injection Pressure (IPR) sensor before removing the fuel electrical connectors. Take out fuel injection supply manifold bolts after which you must extract it as a combined unit with the
Fuel Injectors. The next step involves disconnecting fuel injectors from the fuel injection supply manifold for inspection of O-ring seals before installing new ones when needed. Follow the steps of removal in reverse order while applying clean engine oil to the O-ring seals before installing them.