The most common apparatus in the Honolulu Fire Department (HFD) is the engine. There are 42 engines, one at each station except the aircraft and waterfront stations.  An engine carries a crew of five fire fighting personnel, who are collectively known as a company.  An engine company consists of a fire captain, a fire apparatus operator (Fire Fighter [FF] III), and three fire fighters (FF I). The main characteristic of the engine is the internal water pump that is driven by the apparatus motor through the apparatus transmission.  The internal water pumps on all engines are rated to deliver 1,500 gallons per minute.  In addition, the engines also carry internal water tanks that have a capacity of 500-750 gallons.

Engine 11 (E11) with a supply line connected to a fire hydrant. The supply line feeds water from the hydrant to E11's water pump.	E36's water pump allows the apparatus operator to accurately  distribute water to several different hoselines.
An engine's primary responsibilities include responding to: all fires emergency medical services  hazmat incidents  motor vehicle accidents  natural disasters requests for assistance search and rescues    service requests	The engines are equipped with: automated external defibrillator (AED) emergency medical supplies fire hose and nozzles fire fighting foam ground ladders medical oxygen personal protective equipment portable radios self-contained breathing apparatus various hand tools
Pump panel. The large yellow connection is the pump's water intake.	The internal motor-driven pump that supplies pressurized water for fire fighting hoselines. The pump is mounted behind the apparatus pump panel (see photo on the left).