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Remove the upper intake manifold with a socket wrench and detach the electrical connectors for the fuel injectors. Disconnect the vacuum hose on the front of the fuel rail.

Attach a pair of locking pliers to the adjustment screws on the hose clamps for the fuel return line on the fuel rail. Turn the screws counterclockwise to loosen the clamps and disconnect the fuel return line from the fuel rail. Remove the flare nut on the fuel line with a 12-millimeter socket and disconnect the fuel line from the fuel rail.

Spray compressed air around the base of the fuel injectors to keep debris out of the injector ports. Remove the mounting bolts for the fuel rail with a 10-millimeter socket.

Pad the corner of the valve cover with a clean shop towel and pry the fuel rail with a small pry tool to lift the injectors out of the manifold. Push the fuel lines to the side and remove the fuel rail assembly from the engine.

Pull the fuel injectors from the fuel rail assembly and connect the new fuel injectors. Install the fuel rail assembly to the engine and fasten the mounting bolts for the fuel rail.

Connect the fuel line to the fuel rail with the flare nut. Connect the fuel return line to the fuel rail by attaching the hose clamps and fasten the retaining screws on the clamps.

Connect the vacuum hose to the front of the fuel rail and attach the electrical connectors to the fuel injectors. Replace the upper intake manifold with a socket wrench.

Disconnect the cable for the negative battery terminal with a socket wrench to avoid the accidental discharge of fuel. Open the filler cap on the fuel tank to relieve the pressure in the fuel tank.

Remove the cap for the fuel pressure connection on the fuel rail and wrap a shop towel around the connection. Attach fuel pressure valve J 34730-1A to the fuel pressure connection. Place the open end of the pressure valves bleed hose into a container approved for gasoline open the valve to relieve the pressure in the fuel system. Disconnect the pressure valve and replace the cap for the fuel pressure connection.

Disconnect the fuel lines for the fuel rail with a back-up wrench and discard the O-rings. Detach the fuel return line from the pressure regulator. Disconnect the wiring for the ignition coil and electrical connectors for the fuel injector. Remove the mounting bolts for the fuel rail with a socket wrench and disconnect the fuel rail assembly by pulling on both sides of the fuel rail with equal force.

Cover the open fuel lines with masking tape to keep debris out of the fuel lines. Release the retaining clips for the fuel injector and discard them. Detach the fuel injector from the fuel rail. Discard all of the O-rings on the fuel injectors.

Apply a thin layer of engine oil to the new O-rings. Install the O-rings onto the new fuel injectors and place the new retainer clip onto the fuel injector. Place the fuel injectors into the sockets on the fuel rail so the electrical connections on the fuel injectors face outwards. Lock the retainer clips for the fuel injectors.

Install the fuel rail by performing steps 3 and 4 in reverse order. Fasten the cap for the fuel tank and connect the cable on the negative battery terminal with a socket wrench. Turn the ignition on for two seconds to pressurize the fuel system, then turn the ignition off for 10 seconds. Turn the ignition back on and check for fuel leaks.

Remove the mounting bolts for the valve cover with a socket wrench and disconnect the valve cover. Unplug the wiring harnesses from the fuel injectors, and disconnect the crankcase-to-head tube assembly from the engine.

Remove the mounting bolts for the oil rail with a socket wrench and disconnect the oil rail. Push the electrical connector for the fuel injector out of the rocker arm carrier with a small pry tool. Plug the oil drain holes next to the glow plugs with clean shop rags.

Disconnect the mounting bolt for the fuel injector with a socket wrench and release the hold-down clamp on the fuel injector. Remove the fuel injectors from the fuel rail with a Snap-On SDMT440 Torx tool so that you dont damage the fuel injectors plastic housing. Remove the shop rags from the oil drain holes. Discard the O-rings and copper washers on the fuel injectors.

Mount the new O-rings and copper washers on the fuel injectors. Lubricate the fuel injectors with engine oil and install the fuel injectors to the fuel rail. Attach the hold-down clamps for the fuel injectors and tighten the mounting bolt 24 ft. lbs. with a torque wrench. Connect the electrical connector to the rocker arm carrier and coat the upper O-rings on the fuel injectors with engine oil.

Place the oil rail on the fuel injectors so that the single ball tubes on the oil rail engage the lead angle of the fuel injectors. Insert a guide bolt into each end of the oil rail and a guide bolt in the middle of the oil rail to temporarily hold it in place. Push the oil rail into the fuel injectors so the mounting feet of the oil rail are flush with their mounting surface on the engine block. Install mounting bolts for the oil rail into the six available holes and replace the three guide bolts with mounting bolts. Tighten the nine mounting bolts to 10 ft. lbs with a torque wrench.

Connect the crankcase-to-head tube assembly and tighten the mounting bolts to 60 ft. lbs. with a torque wrench. Attach the electrical connectors to the fuel injectors and install the valve covers.

Remove the cable from the negative terminal of the battery with a socket wrench to ensure you dont accidentally start the engine. Release the clip that connects the fuel return line to the fuel injectors and detach the fuel line.

Remove the mounting bolt that attaches the the air cleaner bracket to the valve cover with a socket wrench, and detach the air cleaner bracket from the valve cover. Disconnect the bracket for the crankcase ventilator. Detach the fuel lines to the secondary fuel filter and disconnect the secondary fuel filter.

Release the clamp that holds the vacuum pump in place and move the pump to gain access to the mounting bolts for the intake manifold. Disconnect the mounting bolts with a socket wrench and remove the intake manifold. Place a cover such as GM part no. J-29664-1 to keep debris out of the engine.

Release the clips that attach the fuel injection lines to the loom brackets. Detach the fuel injection lines from the fuel injector nozzles and place caps on the fuel injector nozzles. Disconnect the fuel lines from the fuel injection pump.

Grip the 30mm hex portion of each fuel injector with GM special tool J-29873 and turn the injector counterclockwise to remove it. Remove and discard the fuel injector gaskets. Place a protective cap on the open end of each fuel injector to keep debris out of the fuel injector.

Mount a new gasket to each new fuel injector. Attach GM special tool J-29873 to a torque wrench and install the fuel injector by turning it clockwise with the special tool. Torque the fuel injector to 50 ft. lbs.

Perform steps one through four in reverse sequence to complete the installation of the fuel injectors. Tighten the fittings for the fuel injection lines to 20 ft. lbs. with a torque wrench. Tighten the mounting bolts for the secondary fuel filter to 30 ft. lbs. Tighten the bolts that connect the fuel line to the secondary fuel filter to 9 in. lbs.

Clean the fuel injector nozzles and fittings with fuel oil to prevent fuel contamination when you replace the injectors. Blow the area dry with an air compressor.

Release the retaining clamps on the fuel line to the fuel injector. Fetach the fuel lines from the fuel injectors with a flare nut wrench. Disconnect the run-off tees from the fuel injectors and discard their gaskets. Move the fuel lines out of your way, and cover the ends of the fuel injectors with plastic caps to keep dirt out of the injectors.

Turn the fuel injector counterclockwise with a socket wrench. Pull the injector from its bore, and discard the copper gasket. Clean the injector bore with special tool T83T-9527-A, and blow out the loose debris with an air compressor.

Dab a small amount of anti-seize compound on the nozzle of the new fuel injector, and mount a copper gasket to the injector. Install the fuel injector into its bore, and tighten it to 33 foot-pounds with a torque wrench.

Mount new gaskets to the run-off tees, and connect the run-off tees to the fuel injector. Connect the fuel lines to the fuel injector with a flare nut wrench, and attach the retainer clamps to the fuel injector. Start the engine and check for fuel leaks.

Release the clamps on the fuel lines to the fuel injectors and disconnect the fuel lines with a flare nut wrench. Discard the gaskets for the fuel lines and push the fuel lines to the side so you can access the fuel injectors.

Cover the top end of the fuel injectors with plastic caps to keep them clean. Turn the fuel injectors counterclockwise and pull them from the engine. Record the cylinder of each fuel injector as you remove it. Cover the nozzle end of the fuel injectors with plastic caps.

Remove the copper gasket from the nozzle of each fuel injector with tool T71P-19703-C and discard the gasket. Clean the bore of the fuel injectors with tool T83T-9527-A and blow compressed air into the bore to remove any carbon or metal particles.

Remove the cap from the nozzle of each fuel injector. Apply a small amount of grease to the nozzle and install a new copper gasket to the fuel injector.

Apply an anti-seize compound to the fuel injector threads to prevent the injectors from sticking. Install the fuel injector to its correct cylinder head and tighten it to 33 ft. lbs. with a torque wrench. Remove the protective caps from the open end of the fuel injectors.

Install new O-rings on the fuel return line and connect the fuel lines to the fuel injectors with a flare nut wrench. Attach the clamps for the fuel lines. Start the engine and check for fuel leaks.

Disconnect the valve cover with a socket wrench. Unplug the electrical connector from the fuel injector.

Remove the crankcase-to-head tube assembly with a socket wrench. Disconnect the bolts that attach the oil rail to the engine and remove the oil rail. Extract the fuel injector electrical connector from the rocker arm carrier with a suitable pry tool.

Insert shop rags into the oil drain holes in the crankcase. Remove the bolt for the fuel injector with a socket wrench and disconnect the hold-down clamp from the fuel injector. Remove the fuel injectors from the oil rail assembly with a Snap-On SDMT440 Torx or similar tool. This is necessary to avoid damaging the plastic portion of the fuel injector. Pull the shop rags from the oil drain holes.

Mount new copper washers and O-rings to the new fuel injectors and coat the fuel injectors liberally with engine oil. Install the fuel injectors on the oil fuel rail and connect the hold-down clamps. Tighten the mounting bolt for the fuel injector to 24 foot-pounds, using a torque wrench.

Install the electrical connector for the fuel injector to the rocker arm carrier with a pry tool. Apply engine oil to the fuel injector to lubricate its top O-rings.

Mount the oil rail on top of its carrier. Insert a guide bolt on each end of the straight side of the oil rail, then insert a third guide bolt in the middle of the oil rails wavy side. Press the oil rail into position so that its mounting feet are flush against the oil rails mounting surface.

Install mounting bolts in the six remaining holes of the oil rail and replace the three guide bolts with mounting bolts. Tighten all of the mounting bolts to 10 foot-pounds, using a torque wrench.

Install the crankcase-to-head tube assembly. Tighten the bolts for the crankcase-to-head assembly to 60 foot-pounds, using a torque wrench. Plug the electrical connectors into the fuel injectors. Replace the valve cover with a socket wrench.

Disconnect the cable from the negative battery terminal with a socket wrench to avoid the discharge of fuel while installing the fuel injectors. Open the filler cap on the fuel tank to relieve the pressure in the fuel tank.

Wrap a shop towel around the fuel pressure port on the fuel rail to soak up fuel leaks. Connect a fuel pressure gauge to the fuel pressure port and place the free end of the pressure gauges bleed hose into a gasoline container. Open the valve on the pressure gauge to relieve the pressure in the fuel system. Disconnect the fuel pressure gauge from the fuel pressure port.

Disconnect the outlet resonator of the air cleaner with a socket wrench. Detach the fuel lines from the fuel rail and unplug the electrical connectors for the fuel injectors. Disconnect the mounting bolts for the fuel rail and remove the fuel rail from the cylinder heads.

Release the retainer clip on the fuel injectors and remove the fuel injectors from the fuel rail. Remove the O-rings from the fuel injector and discard them.

Mount the new O-rings to the fuel injectors and attach the fuel injector clips. Install the fuel injectors into their corresponding sockets on the fuel rail so the electrical connectors face upward.

Align the fuel injectors with their respective cylinder head ports and install the fuel rail to the cylinder heads. Tighten the retainers for the fuel rail to 89 inch-pounds with a torque wrench.

Attach the electrical connectors to the fuel injectors. Connect the fuel lines to the fuel rail and connect the vacuum hose to the fuel pressure regulator. Install the outlet resonator for the air cleaner with a socket wrench.

Connect the cable to the negative battery terminal. Turn the ignition on for two seconds to pressurize the fuel system. Turn the ignition off and check for fuel leaks.

Remove the fuel pump fuse from the fuse box under the dashboard. Start the engine and allow the engine to stall. Crank the engine to ensure the fuel lines are empty and replace the fuel pump fuse. Disconnect the cable from the negative battery terminal to prevent the battery from generating sparks during the fuel injector replacement.

Disconnect the cover for the No. 2 cylinder head with a socket wrench. Detach the vacuum hose and fuel tube from the fuel pipe. Disconnect the electrical connectors from the fuel injectors.

Disconnect the fuel pipe from the fuel injectors and detach the fuel injectors from the engine. Remove the spacers from the cylinder head and pull the fuel injectors away from the fuel pipe. Discard the O-ring and grommet for the fuel injectors.

Coat the new O-rings and grommets with light machine oil before installing them onto the new fuel injectors. Coat the mounting surfaces on the fuel pipe with light machine oil. Install the new fuel injectors into the fuel pipe by twisting them into place so that the electrical connectors face away from the fuel pipe. Coat the injector bores in the cylinder head with light machine oil.

Install the spacers and connect the fuel pipe to the cylinder heads. Tighten the mounting bolts for the fuel pipe to 14 foot-pounds with a torque wrench. Attach the fuel line and the PCV hose to the fuel pipe. Connect the cover for the No. 2 cylinder head and tighten its mounting bolts to 7 foot-pounds. Connect the cable for the negative battery terminal with a socket wrench.