A device employed to ascertain the necessary flow rate and pressure specifications for a fuel delivery system component. It functions by inputting engine parameters such as horsepower, fuel type, and target air-fuel ratio to estimate the fuel volume required under peak operating conditions. For example, specifying an engine producing 500 horsepower running on gasoline will yield a minimum gallons-per-hour (GPH) rating needed to adequately supply the engine with fuel.
Accurate assessment of fuel delivery needs prevents engine damage due to fuel starvation and ensures optimal performance. Historically, estimations were performed manually using complex calculations and assumptions. Contemporary methodologies automate this process, enhancing precision and minimizing the potential for human error. Correct fuel pump selection is paramount for both street and racing applications to maintain consistent fuel pressure and avoid lean-out conditions.