High Pressure Fuel Pump

The BMW High Pressure Fuel Pump (HPFP), manufactured by Bosch, is an essential part of modern gasoline direct injection (GDI) engines. This pump operates by increasing fuel pressure to very high levels, often exceeding 2,000 psi, to enable direct injection into the combustion chamber. This process improves fuel atomization, leading to better engine efficiency and higher power output. Common issues with this type of high-pressure fuel pump include the failure of the fuel quantity control valve, which can trigger pressure faults on the high-pressure side of the fuel system (SAE P0001 fault). Another potential failure is internal leaks that allow fuel to contaminate the engine oil, resulting in significantly negative fuel trim corrections. Symptoms of a failing HPFP can range from engine performance problems like hard starting, hesitation, misfires, and loss of power under load, to check engine lights with lean/rich codes, reduced fuel economy, and unusual noises or fuel leaks from the pump area. This Bosch HPFP, with part number 13518631642, is manufactured in Germany and is an OE (Original Equipment) quality component. It is designed as a direct replacement or upgrade for various BMW, Mini, and Toyota Supra models equipped with B46, B48, and B58 engines, particularly the B58TU variants.