Bosch 66821 Direct Injection High Pressure Fuel Pump

Overview of Bosch GDI High Pressure Pump (New)

The Bosch GDI High Pressure Pump (New) is designed to meet the precise fuel delivery requirements of direct injection systems. Engineered for select Mercedes-Benz models, this electric internal fuel pump ensures consistent high-pressure fuel supply for optimal engine performance.

• Brand: Bosch
• Brand Line: GDI High Pressure Pump (New)
• Part Number: 66821
• Type: Direct Injection High Pressure Fuel Pump
• Electric operation, internal mounting
• Includes one high pressure pump per package
• Compatible with multiple Mercedes-Benz models

Product Line Details

The Bosch GDI High Pressure Pump (New) line focuses on delivering reliable, new direct injection fuel pumps designed specifically for high-pressure fuel delivery systems. This product line emphasizes precision engineering and compatibility with modern fuel injection technology, ensuring proper fuel atomization and engine efficiency in vehicles equipped with gasoline direct injection.

Detailed Product Description

This Bosch direct injection high pressure fuel pump (part number 66821) operates electrically and is designed for internal installation within the fuel system. It features a single outlet and does not include gaskets or mounting hardware, so professional installation with appropriate components is recommended. The pump is intended for use in Mercedes-Benz vehicles such as the C300, C350, E350, E400, GLE350, GLK350, ML350, R350, and SLK350 models. Its precise fuel delivery supports the high-pressure requirements of GDI engines, contributing to efficient combustion and engine performance.

Common Applications and Issues Addressed

• Restores proper fuel pressure in direct injection systems
• Resolves engine hesitation or stalling related to fuel delivery
• Eliminates rough idling caused by inconsistent fuel supply
• Addresses fuel pump failure symptoms in Mercedes-Benz GDI engines
• Supports fuel system maintenance and component replacement

Installation Notes and Tips

Installation requires removal of the old high pressure fuel pump and replacement with this new Bosch unit. Since the pump is internally mounted and electric, ensure all electrical connections are secure and fuel lines are properly sealed. Note that gaskets and mounting hardware are not included, so these should be sourced separately. Professional installation is recommended to maintain fuel system integrity and safety.

Quality Assurance and Warranty

As a new component from Bosch, this GDI High Pressure Pump (New) meets OEM standards for fit and function. Bosch is known for stringent quality control in fuel system components. While specific warranty details are not provided here, Bosch typically offers limited warranties on new fuel pumps. Verify warranty coverage with the supplier or manufacturer documentation.