In most applications, an upgraded performance fuel pump is suggested for a modified engine or increased horsepower. For example, a factory fuel pump typically operates in the range of 40 to 60 PSI, which is sufficient for all factory engines. Performance pumps are capable of up to 100 PSI in high-horsepower applications. Aftermarket turbocharged or supercharged engines would need these types of higher pressures to maintain proper fuel delivery and to avoid lean conditions that could contribute to engine knock or damage.
Upgrading becomes necessary for those adding 20% or more horsepower. A performance Fuel Pump ensures the proper amount of fuel reaches the engine under high loads, such as during quick acceleration. Walbro is a well-recognized brand for high-flow pumps, with some of their models designed to handle engines that produce over 300 horsepower with pressures a factory pump cannot keep up with.
Price varies with vehicle and pump configuration, but most performance fuel pumps fall in the range of $200-$600. As would be expected with increased upfront cost, performance pumps provide extra-long service life and reliability under load conditions. As Car expert and tuner ChrisFix adds, "Upgrading your fuel pump is one of the best steps to support other performance mods," since it rebalances air-fuel mixtures critical to engine efficiency and power output.
Having in mind fuel pump upgrades go hand in glove with tuning requirements and other changes in the power unit. Higher flow rates give way to bigger-sized injectors for more agile acceleration and clean power delivery; it is, therefore, an excellent investment by any enthusiast who looks for more from the engine outside the factory set-ups.