Throttle response is highly affected by fuel pumps as they dictate just the right amount of fuel and pressure to leave into engine. As you open the throttle, it administers fuel for air to ensure that your engine can access an increased level of power promptly. This smooth acceleration is provided by the fuel pump, which can fluctuate -fuel flow practically instantly. Most cars use fuel pumps delivering anywhere from 90-255 liters per hour (LPH), while high-performance engines can demand as much as 400 LPH to maximize throttle response.
One of the most important aspects is fuel pressure. Standard fuel system pressures typically run from 30 to 60 PSI depending on the engine being used. Should it fail to keep the right pressure, especially when applying sudden throttle input (demand), the engine will stumble and run poorly. Specifically in turbocharged cars, where just a hint of throttle response could mean the difference between life and death/a lean air-fuel mixture; bad throttle input can bring down engine power by up to 15%.
Throttle position is monitored continuously by electronic control units (ECUs) which then modulate the fuel pump's output accordingly. The journalistellanews.com grooves in the hybrid tank that serves as an intermediate container between pump and injector. Opening up 'Throttle, ECU returns its operation signal to send more fuel through return line from ergo20 flake for best possible power-to-air ratio into engine stream inside header engines! Throttle lag happens when the fuel pump cannot satisfy what is being asked of it by the ECU, and hence screws up overall car performance. In high-performance racing, a sluggish throttle response because of inefficient fuel pump can mean the difference between winning and losing by several tenths on every lap that is just not acceptable in any competitive motorsports.
Calibration of the fuel pumps is another critical area, they must be properly calibrated to deliver enough but not too much or little as the engine requires. High-flow fuel pumps from the aftermarket are often used in modified cars to offer improved throttle response, especially if their engines are making more than 500 horses. Often with modified engines, the wrong pump can even result in hesitation or misfires during hard acceleration and prolonged full-throttle use of a turbocharged engine may cause some fuel pumps to suffer vapor-lock (a state where liquid is forbidden to flow through an overheated outlet line).
If you're asking the question "How do fuel pumps affect throttle response, then this video is also going to help. The answer is fuel flow, pressure regulation and ECU-controlled fuel delivery. A well-tuned fuel pump will result in smooth, instant throttle response--particularly when the pedal hits the metal. Source Related Fuel Pump Performance.