What kind of pump do you record the time crank?

• A. Gasoline
• B. Electric
• C. Diesel
• D. Steam

Answer: (C)

Crank time refers to how long the starting mechanism must run to get the engine up to speed and producing pump pressure. This measurement is specific to engine-driven pumps, where starting the engine is a mechanical process that requires rotation after ignition.

Diesel engine-driven fire pumps are started by cranking (often with an electric starter) until the engine fires and reaches running speed. Measuring the crank time under test conditions ensures the unit can start reliably within an acceptable period, which is critical for readiness in a real fire scenario.

Electric, steam, and most gasoline starters don’t involve a crank sequence in the same way. Electric pumps start by applying power to a motor, which is essentially instantaneous, and steam-driven units start and reach operation through steam pressure without a cranking phase. This is why the concept of “time to crank” is associated with the diesel pump in this context.