In recent years Aftermarket Industries has witnessed the development of turbine style in-tank fuel pumps which are now commonly used as OEM options by the majority of car makers. A turbine pump consists of blades and an impeller ring attached to the motor. As the impeller spins, the impeller blades push fuel through the pump and unlike positive-displacement pumps, turbine pumps do not pulsate, are more efficient and are substantially quieter in operation. Turbine style pumps are in fact more durable than roller vane pumps and are less complex in design. A perfect example of this is the Walbro series of fuel pumps manufactured in the U.S by TI Automotive.
Walbro pumps (Walbro 255 and Walbro 460) feature twin turbine blades attached to a common shaft similar to the design of a jet engine. Fuel is pressurised as it flows through the pump axially without forcing the fluid to change direction. So what does this mean? Higher flow rates throughout the fuel pressure range. In fact, the Walbro F90000267, or as we refer to them ‘Walbro 460’, outflow a Bosch 044 fuel pump by 30% to 50% at various fuel pressure intervals. You would require almost three Bosch 044s to match the fuel flow volume of two Walbro 460s. Back in the day, two Bosch 044s would be more than sufficient to support your 550hp, 11 second Subaru WRX running 30psi on unleaded fuel and you were more than happy to “put up” with the noise because there were no other alternatives.