Fuel pumps (particularly in high performance vehicles, or vehicles that have been modified to produce more power) are very capable of adding horsepower by ensuring the fuel is being consistently delivered at a given flow. Performance fuel pumps include high-performance, which offer higher flow rates as a result of them being paired with performance upgrades such as turbochargers or high-flow exhaust systems. A high-flow pump of 255+ liters per hour (LPH) allows the engine to have ample fuel via higher RPMs for up to a fictional sensational increase in horsepower from modifications by as much as 10-15% based on how youve got it set.
Fuel Pressure Consistency: To get the most from your performance fuel injectors, you need to ensure that its FP is consistent all throughout those 40-60 psi (depending on the engine) it may have when boosting. As fuel delivery falters, so too does power output, as the bike runs lean with sporadic doses of petrol. Automotive-tuning research has shown that high-flow fuel pumps help powerful engines attain 10-20 horsepower more consistently at the point of peak RPM compared to standard units, demonstrating how critical fuel pressure is in extracting full power.
For higher horsepower capability, a high-performance fuel pump is almost always the easiest upgrade to quench that increased thirst. The stock fuel pump can deliver enough gas to the engine when operating under factory settings but may not be robust enough if it has undergone significant modification. Performance fuel pumps capable of withstanding the added demands that a continuous high-flow engine require help to an engine's full power potential Aftermarket fuel pumps can also significantly increase horsepower potential up to 15-25% in competition level dry sump systems as these low voltage, high flow rate pumps remove any resistance to the power levels and modify your intake/exhaust/forced induction system.
It also makes power because it keeps fuel from being starved off—by even delaying the amount of time that fuel is delivered, you hurt your ability to accelerate and jump on throttle. In competitive racing or high demand situations, a proper Fuel Pump will provide an even supply while in use, which translates to increased throttle response and maximizes horsepower. This consistent performance allows the engine to keep up with heavy-duty workloads, resulting in a smoother finish that generates more power.
As for the fuel pump, it doesn't add horsepower. However, provides consistent high-pressure gas delivery and allows performance upgrades as needed throughout growth of vehicle tuning goals. By extracting the best fuel flow and pressure, you get your engine to operate at the very limit of what it can do with complementary upgrades which frees up horsepower.