Bosch 66803 Direct Injection High Pressure Fuel Pump

Bosch GDI High Pressure Pump for BMW

Bosch 66803 is a new direct injection high pressure fuel pump for select BMW applications. It supports precise fuel delivery for GDI systems and is built to Bosch quality standards used in original equipment production.

The Bosch GDI High Pressure Pump (New) line focuses on consistent fuel pressure, dependable operation, and OE-style fitment for direct injection engines. This part number, 66803, is a direct injection high pressure fuel pump for internal mounting applications with one outlet and electric operation.

Key Features

• Brand: Bosch
• Brand line: GDI High Pressure Pump (New)
• Part number: 66803
• Part type: Direct Injection High Pressure Fuel Pump
• Electric operation
• Internal mounting location
• New, not remanufactured
• One outlet
• No gasket included
• No mounting hardware included

Detailed Description

Bosch 66803 is engineered for BMW direct injection fuel systems that require a high pressure pump with OE-level manufacturing control. Bosch states that these pumps are produced on the same lines and tested to the same quality standards as original equipment fuel pumps, helping maintain reliable fuel delivery in demanding engine applications. This part cross-references URO 13517595339 for the same application.

Compatible With BMW X6, BMW 550i, BMW 550i GT, BMW 550i GT xDrive, BMW 550i xDrive, BMW X5, BMW 650i, BMW 650i xDrive, BMW 750i, BMW 750i xDrive, BMW 750Li, and BMW 750Li xDrive across the listed model years. Search terms such as BMW X5 high pressure fuel pump replacement, BMW 550i direct injection fuel pump, and Bosch 66803 fuel pump help identify this application.

What It Helps Address

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

Installation Notes

Verify the vehicle’s engine code, fuel system configuration, and connector style before installation. This pump is an internal electric unit, so inspect the mounting surface, seals, and fuel lines during replacement. Because gaskets and mounting hardware are not included, reuse or replace related service parts as needed according to the vehicle repair procedure.

Quality Assurance

Bosch manufactures this pump using production and testing standards aligned with its original equipment fuel pump process. The result is a new replacement part built for consistent performance in BMW direct injection applications, including Bosch 66803 installations on select BMW X5 and BMW 550i models.