2780701201 BEMWQ High Pressure Pump for Mercedes Benz W166 X166 C292 M157

The BEMWQ High Pressure Pump (Part No.: 2780701201) is a critical fuel delivery component designed for Mercedes-Benz vehicles equipped with the M157 5.5L V8 Biturbo engine. It is fully compatible with chassis models including the W166 (ML/GLE-Class), X166 (GL/GLS-Class), and C292 (GLC Coupe). This direct-injection high-pressure fuel pump (HPFP) is typically camshaft-driven and responsible for drawing low-pressure fuel from the tank and amplifying it to extremely high pressures (often exceeding 200 bar / 2,900 psi) required by the direct injectors for precise fuel atomization, efficient combustion, and optimal engine performance .

• Precision OEM Specification:​ Manufactured to match the original equipment standard 2780701201, ensuring exact mounting flange alignment, correct electrical connector pinout, and seamless integration with the M157 engine’s fuel delivery system without modification .

• High-Pressure Output & Stability:​ Engineered with precision-machined internals (such as hardened plungers and cylinders) and advanced sealing technology to deliver consistent, stable high-pressure fuel output across all RPM ranges and load conditions .

• Durable & Heat-Resistant Build:​ Constructed with a premium-grade aluminium alloy housing and reinforced internal stainless steel components designed to withstand the extreme pressures, engine bay heat, and vibrations inherent to high-performance Biturbo V8 operation .

• Direct Fitment:​ Designed as a complete assembly, ready for straightforward bolt-on installation using existing mounting points, fuel line connections, and electrical plugs for immediate operation .

• Restored Engine Power & Throttle Response:​ Eliminates common issues caused by a failing high-pressure pump—such as long cranking/hard starting, significant power loss under load, hesitation during acceleration, and high-RPM stumbling—by restoring proper rail pressure and fuel volume .

• Smoother Idle & Fuel Efficiency:​ Corrects rough or unstable idling and erratic air-fuel mixtures often triggered by internal pump wear or pressure drop, helping to optimize fuel atomization and combustion efficiency .

• Check Engine Light & Fault Code Resolution:​ Directly addresses common HPFP-related diagnostic trouble codes (e.g., low fuel pressure codes, P0087, P0088) and sensor circuit faults, turning off the dashboard warning light and preventing the vehicle from entering reduced-power "Limp Mode" .

• Cost-Effective Performance Repair:​ Provides a dependable and high-quality economical alternative to OEM parts for resolving fuel delivery issues, which is a known wear item on higher-mileage M157 engines (often recommended to inspect around 100,000 km / 60,000 miles), securing the long-term reliability and driving dynamics of the AMG powertrain .