When should a D/O Pumper start the pump?

Starting the pump once on the scene and before sending water to the hose is the correct procedure because it ensures that the pump is properly engaged and ready to supply water effectively when needed. This timing allows the Driver/Operator to assess the situation on the ground, configure the system appropriately, and verify everything is operational before initiating water flow.

Ensuring the pump is started at this point mitigates potential issues such as air pockets or improper pressure buildup that can occur if water is sent through the hoses prematurely. It also allows for a systematic check of all equipment to confirm it is operational before engaging with the firefighting effort. Overall, this approach enhances safety and efficiency during critical operations.