2005 Buick Rainier Fuel Pressure Regulator

You should relieve the fuel system pressure, disconnect the fuel feed pipe from the fuel rail, remove the intake manifold, clean the fuel rail assembly and the cylinder head with a spray type engine cleaner, GM X-30A or equivalent, disconnect the fuel injector harness in-line connector from the engine wire harness, remove the fuel injector harness in-line connector from the rocker cover, the fuel rail attaching bolts, the fuel rail assembly and the injector lower O-ring seal from the spray tip end of each injector and discard the O-ring seals.

You should raise the vehicle, remove the fuel tank shield and the fuel pressure service connection cap, located near the fuel filter, install the J 34730-1A fuel pressure gage to the fuel pressure service connection, located near the fuel filter, turn on the ignition, place the bleed hose of the fuel pressure gage into an approved gasoline container, open the bleed valve on the fuel pressure gage to bleed the air from the fuel pressure gage, command the fuel pump on with a scan tool, close the bleed valve on the fuel pressure gage and inspect for fuel leaks.

You should remove the fuel tank cap and relieve the fuel system pressure before servicing the fuel system to reduce the risk of personal injury. Then, you should remove the fuel pump relay from the junction box, crank the engine, allow the engine to start and stall, crank the engine for an additional 3 seconds to ensure the relief of any remaining fuel pressure, disconnect the negative battery cable to avoid re-pressurizing the fuel system, install the fuel pump relay to the junction box and tighten the fuel filler cap.