[ZsevneeONE]

i couldn't explain the steps in my own words so i found this far ya from a service manual.............."Changing an injection pump on a GM 6.2L Diesel is not as difficult as one might expect. Getting to the injection pump requires removing the air cleaner assemble and the intake manifold. Before the manifold can be removed, several brackets may need to be loosened and removed from the studs that hold on the intake manifold. This may include the air conditioner condenser bracket and alternator bracket. Be sure and note the location of the studs and the lengths of the bolts so that they can be reassembled in the proper holes. Once the intake manifold is removed it’s a good idea to remove the vacuum pump. This allows enough room for the injection pump to be removed with the injection lines attached. Loosen the injection line brackets and take the injection lines from each injector. Next, remove the oil fill spout from the front of the engine exposing the pump drive gear. Bar the engine over until a bolt is exposed and can be removed. There are 3 bolts that hold the drive gear to the pump but they can only be removed one at a time so after each one is removed the engine should be barred over until the second bolt can be removed and then a third time to expose the last bolt. Once these three bolts are removed the fuel line should be removed. Then the 3 nuts that hold the injection pump on can be removed and the injection pump slid toward the rear of the engine. The pump has to be moved far enough that the button in the center of the drive shaft will clear the engine. Be careful of the glow plug wires and make sure not to hang on one of them. Once the pump is removed note the location of the timing pin in the pump drive (such as 4:00 o’clock position) this will help when reinstalling the pump to the engine."