Bosch 66804 Direct Injection High Pressure Fuel Pump

Bosch GDI High Pressure Pump for Mercedes-Benz

Bosch 66804 is a new direct injection high pressure fuel pump for Mercedes-Benz applications that require precise fuel delivery at elevated pressure. Built for internal mounting and electric operation, it supports consistent performance in GDI systems where fuel pressure control is critical.

The Bosch GDI High Pressure Pump line brings OE-level manufacturing discipline to the aftermarket. Bosch produces these pumps on the same production lines used for original equipment parts and tests them to the same quality standards, helping deliver dependable service life in demanding fuel system applications.

Key Features

• Direct injection high pressure fuel pump for gasoline direct injection systems
• Electric pump design with internal mounting
• New part, not remanufactured
• Single outlet configuration
• Fuel pump gasket and mounting hardware are not included
• Cross-reference: 2740700501
• Part number: Bosch 66804

Fitment

• Fits 2021-2023 Mercedes-Benz Metris, N/A
• Fits 2020-2023 Mercedes-Benz Sprinter 1500, N/A
• Fits 2020-2023 Mercedes-Benz Sprinter 2500, N/A
• Fits 2018-2020 Mercedes-Benz GLC350e, N/A
• Fits 2016-2020 Mercedes-Benz Metris, N/A
• Fits 2018-2020 Mercedes-Benz SLC300, N/A
• Fits 2017-2019 Mercedes-Benz E300, N/A
• Fits 2016-2019 Mercedes-Benz GLC300, N/A
• Fits 2019 Mercedes-Benz Sprinter 1500, N/A
• Fits 2019 Mercedes-Benz Sprinter 2500, N/A
• Fits 2015-2018 Mercedes-Benz C300, N/A
• Fits 2018 Mercedes-Benz C350e, N/A
• Fits 2017 Mercedes-Benz C300, N/A; German Built Vehicle
• Fits 2016-2017 Mercedes-Benz C350e, N/A; German Built Vehicle
• Fits 2017 Mercedes-Benz SLC300, N/A; German Built Vehicle
• Fits 2016 Mercedes-Benz SLK300, N/A; German Built Vehicle

What It Helps Address

• Hard starting caused by insufficient high-pressure fuel delivery
• Fuel pressure loss in gasoline direct injection systems
• Engine hesitation or stumble under load
• Driveability issues related to inconsistent injector supply pressure
• Check engine concerns tied to high-pressure pump performance

Installation Notes and Tips

Verify the vehicle’s engine code and build details before ordering, especially for Mercedes-Benz C300, C350e, SLC300, and SLK300 applications with German-built vehicle notes. Confirm the original pump part number and inspect the fuel system for contamination or wear that could affect the new pump. Because this is an internal electric high pressure pump, proper diagnosis of low-side supply, electrical power, and direct injection pressure control is important before replacement.

Quality Assurance

Bosch manufactures this pump using the same production standards applied to its original equipment fuel pumps, then tests it to those standards for consistent quality and long-term reliability. Bosch 66804 is a new replacement part engineered for direct injection fuel system service in Mercedes-Benz applications.