GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1996 🢒 GMC Suburban - 4WD 🢒 Engine 🢒 Engine Controls - 6.5L 🢒 Fuel Injection Pump Replacement

Removal Procedure
  1. Remove the negative battery cables. Refer to

    Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

  2. Remove the intake manifold. Refer to Intake Manifold Removal.
  3. Remove the injection lines. Go to Fuel Injection Line Replacement .
  4. Remove the fuel inlet line from the injection pump.
  5. Remove all necessary harness connectors and hoses from the injection pump.
  6. Remove the fuel return line at the top of the injection pump.
  7. Remove the oil fill tube.
  8. Remove the grommet for oil filler tube.

    9. Object Number: 27614 Size: SH
  9. Rotate the engine to gain access to the bolts (1) that hold the driven gear to the injection pump. Access is gained through the oil filler neck hole.
  10. Remove the driven gear bolts.

    11. Important : Never engage the starter motor to rotate the engine when the injection pump is removed as severe engine damage will occur. With the injection pump removed the pump driven gear could jam in the front housing by engaging the starter motor, resulting in a sheared crankshaft or camshaft gear key and possible valve train damage. Always bar the engine over by hand to avoid internal engine damage.

  11. Remove the injection pump flange nuts. Use wrench J 41069.
  12. Remove the injection pump.
  13. Cap all open lines and nozzles.
  14. Remove the flange gasket.

Installation Procedure
  1. Install the new flange gasket on the injection pump .

    2. Object Number: 27612 Size: SH
  2. Adjust locating stud (1) to proper position to match with the slotted/elongated hole in driven gear.

    3. Important: Be sure the locating stud (1) on the injection pump hub goes into the slotted/elongated hole in the driven gear.


    Object Number: 27613 Size: SH
  3. Install the injection pump making sure the locating stud is positioned within the slotted/elongated hole (3) in the driven gear.
  4. Install the injection pump flange nuts.

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

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.


    Object Number: 27614 Size: SH

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

  5. Install the driven gear bolts (1).

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

  6. Install the grommet for oil filler tube.
  7. Install the oil filler tube.
  8. Install the fuel feed line at the injection pump.
  9. Install the fuel return line to the top of the injection pump.
  10. Install all necessary harness and connectors.
  11. Install the injection lines. Refer to tags on lines. Go to Fuel Injection Line Replacement .
  12. Install intake manifold. Refer to Intake Manifold Installation.
  13. Install negative battery cables.
  14. Adjust injection timing. Go to Checking/Adjust Injection Timing .