HDP6 High-Pressure Fuel Pump

The Bosch 0261520520 is a genuine Bosch HDP6 high-pressure fuel pump (HPFP) that serves as both a direct replacement and a performance upgrade for B46, B48, and B58 engines. This pump offers increased fueling capabilities, with a flow rate of 1.178 cc/rev and a maximum pressure of 350 bar, compared to the stock HDP-5-EVO pump's 0.954 cc/rev and 250 bar. For Gen 1 B58 owners, this HPFP is a crucial upgrade, capable of supporting 525-600 whp on pump gas and 450-525 whp on E30 fuel blends. Owners of B46/B48 engines manufactured up to 2019 will also see benefits; however, it's advised to check if the 2019 models already have the upgraded pump installed. This pump is compatible with most BMW, Mini, and Toyota Supra B48/B58 variants. Installation on Gen 1 B58/B48 engines requires a wire harness extension (CTS-WH-008), sold separately. While no tuning is strictly required for basic operation, tuning is necessary to achieve maximum performance gains. For Gen 1 B58/B48 installations, the connector housing for the fuel quantity control valve may need to be rotated, a process described as straightforward. Alternatively, an extension harness can be used, though it is not essential as the connector can be rotated. Failure of a direct injection high-pressure fuel pump can lead to various drivability issues, including hard starting, hesitation, misfires, loss of power under load, check engine lights, and lean/rich codes. This Bosch HPFP is engineered in Germany to OE specifications, ensuring quality and reliability.