For turbocharged applications, the importance of a fuel pump cannot be overemphasized; this is because it must do more work supplying all that additionally-needed amount of fuel for running your system. For example, turbo engines are able to achieve more power (up to 20-40%) than naturally aspirated engine and they rely on fuel supply at a certain rate in order that maintains high pressure is present all the time inside the fuel lines while support combustion process with richer air-fuel ratio values. For example, a turbocharged engine at 15 PSI of boost may need as much as 30% more fuel flow than non-turbo motors and require you to go with an aftermarket fuel pump.
In turbocharged applications, the load on the fuel pump is increased; this assures enough petrol to be supplied in order not to have any pressure drops. Fuel pumps that offer a consistent flow rate of 255 liters per hour prove effective under high boost in some cases, and this technology is developed by the manufacturers like AEM and Walbro. This ensures that turbo engines perform at peak power without starving for fuel, and in turn causing engine knock or other damage. “Speed is the essence of war”, Sun Tzu — Turbo engines, updated Quincy Illinois ELCC quotation applicable to fuel flow speed as needed for optimum performance.
Turbo engines also call for bespoke, ultra-high-pressure fuel pumps that can effectively interface with air-fuel ratio-monitoring engine management systems. Today's ECUs adapt fuel injection timing and quantity through the use of various sensors so that turbo engines run cleanly over a wide range of engine speeds. One solution is the integration of precisely controlled fuel pumps directly in their turbo systems, as Bosch has done for example.
If the fuel pump cannot be trusted, then turbo engines can operate in a lean condition which not only reduce engine performance by up to 20% but also raise exhaust temperatures high enough to harm the precious (and expensive) turbine as well. So, if you want to take advantage of the massive power on tap through that turbocharged engine then a high-quality and strong Fuel Pump is an essential for any performance enhancement. Whether stainless or double resleeved, these pumps aid not only in combustion tuning and ensuring longevity on stock turbo applications but they are a mandatory purchase when building any high-boosted car with one of their own RWD powertrains.