In some cases, fuel pump upgrades can also lead to improved power — especially in any significant force or turbocharged motor with bigger fuel requirements. Stock fuel pumps can operate in the 40–70 PSI range and have flow rates of 100–200 liters per hour (LPH), often unable to provide the necessary fuel for engines over 400 horsepower. A high-flow fuel pump—one that flows more than 255 LPH at a constant pressure—is an absolute must if you want to make some power, and more importantly help maintain it at higher RPMs.
For high-performance engines to reach top power levels, their air-to-fuel ratios need to be within certain tolerances and a standard pump can’t always maintain proper fuel pressure when load is high, causing lean conditions and power limitations. With high performance engines that could potentially experience drops in pressue over time, upgraded fuel pumps are essential to keep the fuel delivery stable, keeping you misfire free and at full power. On others, like turbocharged applications that require up to 300 LPH of fuel, a high-flow pump is the only way to ensure dependable performance and desired flywheel horsepower.
According to a study performed by the Society of Automotive Engineers (SAE), upgraded fuel pumps were found to increase power by 5–10% in modified engines because they maintained sufficient fuel pressure at peak load conditions. Electronic fuel injection (EFI) systems also reap the rewards of upgraded pumps, as EFI needs stable pressure to get the best timing on the injection. An appropriately sized pump prevents over-lean conditions, ensuring that the combustion cycle is as powerful as possible and also maximizes the engine’s total efficiency and output.
It’s essentially been said, “Fuel is the lifeblood of power”, as noted by automotive icon Carroll Shelby due to the importance of strong fuel systems in maximizing performance. Sure, a new aftermarket fuel pump is helping contribute to the big numbers, but if plans are in mind for upgraded injectors, turbochargers, and larger throttle bodies, you can be confident enough that there is fuel being supplied to keep up with the mods.
Those interested in squeezing the most performance out of their ride should know that an appropriate Fuel Pump used in unison with any of the factory fuel system components, is an excellent choice for adding more horsepower, providing stable fuel delivery, and accommodating more extreme driving conditions without compromising reliability.