In a Gasoline Direct Injection (GDI) system, the high-pressure fuel pump is responsible for pressurizing the fuel and delivering it directly into the combustion chamber of each engine cylinder. This pump operates at much higher pressures than traditional fuel injection systems, typically between 500 and 2,500 psi (pounds per square inch). The high pressure is crucial for atomizing the fuel, enhancing combustion efficiency, and improving fuel economy.
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