Installation Procedure

Install the new flange gasket on the injection pump.
Important: Be sure the locating stud (1) on the injection pump hub goes into the slotted/elongated hole in the driven gear.
Adjust the locating stud (1) to the proper position to match with the slotted/elongated hole in the driven gear.

Fig 1: Injection Pump Hub Locating Stud
Courtesy of GENERAL MOTORS CORP.
Install the injection pump making sure the locating stud is positioned within the slotted/elongated hole (1) in the driven gear.

Fig 2: Driven Gear Slotted/Elongated Hole
Courtesy of GENERAL MOTORS CORP.

NOTE: Refer to FASTENER NOTICE .
Install the injection pump flange nuts.
Tighten

Tighten nuts to 40 N.m (30 lb ft).

Fig 3: Injection Pump Flange Nuts
Courtesy of GENERAL MOTORS CORP.

Important: All the driven gear bolts should not be torqued until all the bolts are installed. This will allow for the proper alignment of all the bolt holes.
Install the driven gear bolts (1).
Tighten

Tighten the bolts to 25 N.m (18 lb ft).

Fig 4: Driven Gear Bolts

Courtesy of GENERAL MOTORS CORP.

Install the grommet for the oil filler tube.
Install the oil filler tube.
Install the fuel feed line at the injection pump.
Install the fuel return line to the top of the injection pump.
Install all necessary harnesses and connectors.
Install the injection lines. Refer to the tags on lines. Refer to Fuel Injection Line(s) Replacement .
Install the intake manifold. Refer to INTAKE MANIFOLD REPLACEMENT - UPPER and INTAKE MANIFOLD REPLACEMENT - LOWER .
Install the negative battery cables.
Adjust the injection timing. Refer to Fuel Injection Pump Timing Adjustment .