How do you change high pressure fuel pump on a2005 duramax?

To change the high-pressure fuel pump on a 2005 Duramax, first, ensure the engine is cool and disconnect the battery. Remove the fuel lines and any necessary components obstructing access to the pump, such as the intake manifold or brackets. Carefully unbolt and remove the old pump, then install the new pump, securing it in place and reconnecting the fuel lines. Finally, reassemble any removed components and reconnect the battery before starting the engine to check for leaks.